Commit | Line | Data |
---|---|---|
826d496d MD |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
996b65c8 | 3 | * Copyright (C) 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
fac6795d DG |
4 | * |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
82a3637f DG |
7 | * as published by the Free Software Foundation; only version 2 |
8 | * of the License. | |
91d76f53 | 9 | * |
fac6795d DG |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
91d76f53 | 14 | * |
fac6795d DG |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
fac6795d DG |
18 | */ |
19 | ||
20 | #define _GNU_SOURCE | |
21 | #include <fcntl.h> | |
22 | #include <getopt.h> | |
23 | #include <grp.h> | |
24 | #include <limits.h> | |
7a485870 | 25 | #include <poll.h> |
fac6795d | 26 | #include <pthread.h> |
8c0faa1d | 27 | #include <semaphore.h> |
fac6795d DG |
28 | #include <signal.h> |
29 | #include <stdio.h> | |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
b73401da | 32 | #include <sys/mount.h> |
1e307fab | 33 | #include <sys/resource.h> |
fac6795d DG |
34 | #include <sys/socket.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/types.h> | |
37 | #include <unistd.h> | |
38 | ||
1e307fab | 39 | #include <ltt-kconsumerd.h> |
e88129fc | 40 | #include <lttng-sessiond-comm.h> |
1e307fab DG |
41 | #include <lttng/lttng-kconsumerd.h> |
42 | #include <lttngerr.h> | |
fac6795d | 43 | |
099e26bd DG |
44 | #include "context.h" |
45 | #include "futex.h" | |
20fe2104 | 46 | #include "kernel-ctl.h" |
1e307fab | 47 | #include "ltt-sessiond.h" |
91d76f53 | 48 | #include "traceable-app.h" |
1e307fab | 49 | #include "ust-ctl.h" |
8e68d1c8 | 50 | #include "utils.h" |
099e26bd | 51 | #include "ust-comm.h" |
fac6795d | 52 | |
75462a81 | 53 | /* Const values */ |
686204ab | 54 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
64a23ac4 | 55 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
686204ab MD |
56 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
57 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; | |
58 | ||
fac6795d | 59 | /* Variables */ |
1d4b027a | 60 | int opt_verbose; /* Not static for lttngerr.h */ |
31f73cc9 | 61 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
1d4b027a | 62 | int opt_quiet; /* Not static for lttngerr.h */ |
d063d709 | 63 | |
fac6795d DG |
64 | const char *progname; |
65 | const char *opt_tracing_group; | |
5b8719f5 | 66 | static int opt_sig_parent; |
fac6795d DG |
67 | static int opt_daemon; |
68 | static int is_root; /* Set to 1 if the daemon is running as root */ | |
1d4b027a DG |
69 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
70 | static pid_t kconsumerd_pid; | |
7a485870 | 71 | static struct pollfd *kernel_pollfd; |
099e26bd | 72 | static int dispatch_thread_exit; |
fac6795d | 73 | |
d6f42150 DG |
74 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
75 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ | |
76 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ | |
77 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ | |
fac6795d | 78 | |
1d4b027a | 79 | /* Sockets and FDs */ |
d6f42150 DG |
80 | static int client_sock; |
81 | static int apps_sock; | |
82 | static int kconsumerd_err_sock; | |
8c0faa1d | 83 | static int kconsumerd_cmd_sock; |
20fe2104 | 84 | static int kernel_tracer_fd; |
7a485870 | 85 | static int kernel_poll_pipe[2]; |
1d4b027a | 86 | |
273ea72c DG |
87 | /* |
88 | * Quit pipe for all threads. This permits a single cancellation point | |
89 | * for all threads when receiving an event on the pipe. | |
90 | */ | |
91 | static int thread_quit_pipe[2]; | |
92 | ||
099e26bd DG |
93 | /* |
94 | * This pipe is used to inform the thread managing application communication | |
95 | * that a command is queued and ready to be processed. | |
96 | */ | |
97 | static int apps_cmd_pipe[2]; | |
98 | ||
1d4b027a | 99 | /* Pthread, Mutexes and Semaphores */ |
8c0faa1d | 100 | static pthread_t kconsumerd_thread; |
1d4b027a | 101 | static pthread_t apps_thread; |
099e26bd | 102 | static pthread_t reg_apps_thread; |
1d4b027a | 103 | static pthread_t client_thread; |
7a485870 | 104 | static pthread_t kernel_thread; |
099e26bd | 105 | static pthread_t dispatch_thread; |
8c0faa1d DG |
106 | static sem_t kconsumerd_sem; |
107 | ||
1d4b027a | 108 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
fac6795d | 109 | |
ab147185 MD |
110 | static int modprobe_remove_kernel_modules(void); |
111 | ||
099e26bd DG |
112 | /* |
113 | * UST registration command queue. This queue is tied with a futex and uses a N | |
114 | * wakers / 1 waiter implemented and detailed in futex.c/.h | |
115 | * | |
116 | * The thread_manage_apps and thread_dispatch_ust_registration interact with | |
117 | * this queue and the wait/wake scheme. | |
118 | */ | |
119 | static struct ust_cmd_queue ust_cmd_queue; | |
120 | ||
b5541356 DG |
121 | /* |
122 | * Pointer initialized before thread creation. | |
123 | * | |
124 | * This points to the tracing session list containing the session count and a | |
125 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock | |
126 | * MUST NOT be taken if you call a public function in session.c. | |
04ea676f | 127 | * |
d063d709 DG |
128 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
129 | * lock_session_list and unlock_session_list for lock acquisition. | |
b5541356 DG |
130 | */ |
131 | static struct ltt_session_list *session_list_ptr; | |
132 | ||
996b65c8 MD |
133 | static gid_t allowed_group(void) |
134 | { | |
135 | struct group *grp; | |
136 | ||
274e143b MD |
137 | if (opt_tracing_group) { |
138 | grp = getgrnam(opt_tracing_group); | |
139 | } else { | |
140 | grp = getgrnam(default_tracing_group); | |
141 | } | |
996b65c8 MD |
142 | if (!grp) { |
143 | return -1; | |
144 | } else { | |
145 | return grp->gr_gid; | |
146 | } | |
147 | } | |
148 | ||
273ea72c DG |
149 | /* |
150 | * Init quit pipe. | |
151 | * | |
152 | * Return -1 on error or 0 if all pipes are created. | |
153 | */ | |
154 | static int init_thread_quit_pipe(void) | |
155 | { | |
156 | int ret; | |
157 | ||
158 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); | |
159 | if (ret < 0) { | |
160 | perror("thread quit pipe"); | |
161 | goto error; | |
162 | } | |
163 | ||
164 | error: | |
165 | return ret; | |
166 | } | |
167 | ||
fac6795d | 168 | /* |
d063d709 DG |
169 | * Complete teardown of a kernel session. This free all data structure related |
170 | * to a kernel session and update counter. | |
fac6795d | 171 | */ |
1d4b027a | 172 | static void teardown_kernel_session(struct ltt_session *session) |
fac6795d | 173 | { |
1d4b027a DG |
174 | if (session->kernel_session != NULL) { |
175 | DBG("Tearing down kernel session"); | |
d9800920 DG |
176 | |
177 | /* | |
178 | * If a custom kernel consumer was registered, close the socket before | |
179 | * tearing down the complete kernel session structure | |
180 | */ | |
181 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { | |
182 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); | |
183 | } | |
184 | ||
62499ad6 | 185 | trace_kernel_destroy_session(session->kernel_session); |
1d4b027a DG |
186 | /* Extra precaution */ |
187 | session->kernel_session = NULL; | |
fac6795d | 188 | } |
fac6795d DG |
189 | } |
190 | ||
099e26bd DG |
191 | /* |
192 | * Stop all threads by closing the thread quit pipe. | |
193 | */ | |
cf3af59e MD |
194 | static void stop_threads(void) |
195 | { | |
196 | /* Stopping all threads */ | |
197 | DBG("Terminating all threads"); | |
198 | close(thread_quit_pipe[0]); | |
199 | close(thread_quit_pipe[1]); | |
099e26bd DG |
200 | /* Dispatch thread */ |
201 | dispatch_thread_exit = 1; | |
202 | futex_nto1_wake(&ust_cmd_queue.futex); | |
cf3af59e MD |
203 | } |
204 | ||
fac6795d | 205 | /* |
d063d709 | 206 | * Cleanup the daemon |
fac6795d | 207 | */ |
cf3af59e | 208 | static void cleanup(void) |
fac6795d | 209 | { |
1d4b027a DG |
210 | int ret; |
211 | char *cmd; | |
af9737e9 | 212 | struct ltt_session *sess, *stmp; |
fac6795d | 213 | |
1d4b027a | 214 | DBG("Cleaning up"); |
e07ae692 | 215 | |
1d4b027a | 216 | /* <fun> */ |
2f50c8a3 | 217 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
273ea72c DG |
218 | "Matthew, BEET driven development works!%c[%dm", |
219 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); | |
1d4b027a | 220 | /* </fun> */ |
fac6795d | 221 | |
1d4b027a DG |
222 | DBG("Removing %s directory", LTTNG_RUNDIR); |
223 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); | |
224 | if (ret < 0) { | |
225 | ERR("asprintf failed. Something is really wrong!"); | |
226 | } | |
5461b305 | 227 | |
1d4b027a DG |
228 | /* Remove lttng run directory */ |
229 | ret = system(cmd); | |
230 | if (ret < 0) { | |
231 | ERR("Unable to clean " LTTNG_RUNDIR); | |
232 | } | |
5461b305 | 233 | |
1d4b027a | 234 | DBG("Cleaning up all session"); |
fac6795d | 235 | |
b5541356 | 236 | /* Destroy session list mutex */ |
273ea72c DG |
237 | if (session_list_ptr != NULL) { |
238 | pthread_mutex_destroy(&session_list_ptr->lock); | |
239 | ||
240 | /* Cleanup ALL session */ | |
af9737e9 | 241 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
273ea72c DG |
242 | teardown_kernel_session(sess); |
243 | // TODO complete session cleanup (including UST) | |
244 | } | |
245 | } | |
246 | ||
099e26bd DG |
247 | DBG("Closing all UST sockets"); |
248 | clean_traceable_apps_list(); | |
249 | ||
273ea72c | 250 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
b5541356 | 251 | |
f3ed775e | 252 | DBG("Closing kernel fd"); |
1d4b027a | 253 | close(kernel_tracer_fd); |
ab147185 | 254 | |
2f50c8a3 DG |
255 | if (is_root) { |
256 | DBG("Unloading kernel modules"); | |
257 | modprobe_remove_kernel_modules(); | |
258 | } | |
fac6795d DG |
259 | } |
260 | ||
e065084a | 261 | /* |
d063d709 | 262 | * Send data on a unix socket using the liblttsessiondcomm API. |
e065084a | 263 | * |
d063d709 | 264 | * Return lttcomm error code. |
e065084a DG |
265 | */ |
266 | static int send_unix_sock(int sock, void *buf, size_t len) | |
267 | { | |
268 | /* Check valid length */ | |
269 | if (len <= 0) { | |
270 | return -1; | |
271 | } | |
272 | ||
273 | return lttcomm_send_unix_sock(sock, buf, len); | |
274 | } | |
275 | ||
5461b305 | 276 | /* |
d063d709 | 277 | * Free memory of a command context structure. |
5461b305 | 278 | */ |
a2fb29a5 | 279 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
5461b305 | 280 | { |
a2fb29a5 DG |
281 | DBG("Clean command context structure"); |
282 | if (*cmd_ctx) { | |
283 | if ((*cmd_ctx)->llm) { | |
284 | free((*cmd_ctx)->llm); | |
5461b305 | 285 | } |
a2fb29a5 DG |
286 | if ((*cmd_ctx)->lsm) { |
287 | free((*cmd_ctx)->lsm); | |
5461b305 | 288 | } |
a2fb29a5 DG |
289 | free(*cmd_ctx); |
290 | *cmd_ctx = NULL; | |
5461b305 DG |
291 | } |
292 | } | |
293 | ||
f3ed775e | 294 | /* |
d063d709 | 295 | * Send all stream fds of kernel channel to the consumer. |
f3ed775e | 296 | */ |
7a485870 | 297 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
f3ed775e DG |
298 | { |
299 | int ret; | |
300 | size_t nb_fd; | |
301 | struct ltt_kernel_stream *stream; | |
f3ed775e DG |
302 | struct lttcomm_kconsumerd_header lkh; |
303 | struct lttcomm_kconsumerd_msg lkm; | |
304 | ||
7a485870 DG |
305 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
306 | ||
307 | nb_fd = channel->stream_count; | |
f3ed775e DG |
308 | |
309 | /* Setup header */ | |
7a485870 | 310 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
f3ed775e DG |
311 | lkh.cmd_type = ADD_STREAM; |
312 | ||
313 | DBG("Sending kconsumerd header"); | |
314 | ||
315 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); | |
316 | if (ret < 0) { | |
317 | perror("send kconsumerd header"); | |
318 | goto error; | |
319 | } | |
320 | ||
7a485870 DG |
321 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
322 | if (stream->fd != 0) { | |
f3ed775e DG |
323 | lkm.fd = stream->fd; |
324 | lkm.state = stream->state; | |
7a485870 | 325 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
e8b60857 | 326 | lkm.output = channel->channel->attr.output; |
f3ed775e | 327 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
99497cd0 | 328 | lkm.path_name[PATH_MAX - 1] = '\0'; |
f3ed775e DG |
329 | |
330 | DBG("Sending fd %d to kconsumerd", lkm.fd); | |
331 | ||
332 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); | |
333 | if (ret < 0) { | |
334 | perror("send kconsumerd fd"); | |
335 | goto error; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
7a485870 | 340 | DBG("Kconsumerd channel fds sent"); |
f3ed775e DG |
341 | |
342 | return 0; | |
343 | ||
344 | error: | |
345 | return ret; | |
346 | } | |
347 | ||
348 | /* | |
d063d709 | 349 | * Send all stream fds of the kernel session to the consumer. |
f3ed775e | 350 | */ |
d9800920 | 351 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
f3ed775e DG |
352 | { |
353 | int ret; | |
354 | struct ltt_kernel_channel *chan; | |
7a485870 DG |
355 | struct lttcomm_kconsumerd_header lkh; |
356 | struct lttcomm_kconsumerd_msg lkm; | |
357 | ||
358 | /* Setup header */ | |
359 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); | |
360 | lkh.cmd_type = ADD_STREAM; | |
361 | ||
362 | DBG("Sending kconsumerd header for metadata"); | |
363 | ||
d9800920 | 364 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
7a485870 DG |
365 | if (ret < 0) { |
366 | perror("send kconsumerd header"); | |
367 | goto error; | |
368 | } | |
369 | ||
370 | DBG("Sending metadata stream fd"); | |
371 | ||
d9800920 DG |
372 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
373 | if (session->consumer_fd == 0) { | |
374 | session->consumer_fd = kconsumerd_cmd_sock; | |
375 | } | |
376 | ||
7a485870 DG |
377 | if (session->metadata_stream_fd != 0) { |
378 | /* Send metadata stream fd first */ | |
379 | lkm.fd = session->metadata_stream_fd; | |
380 | lkm.state = ACTIVE_FD; | |
381 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; | |
8b270bdb | 382 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
7a485870 | 383 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
99497cd0 | 384 | lkm.path_name[PATH_MAX - 1] = '\0'; |
7a485870 | 385 | |
d9800920 | 386 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
7a485870 DG |
387 | if (ret < 0) { |
388 | perror("send kconsumerd fd"); | |
389 | goto error; | |
390 | } | |
391 | } | |
f3ed775e | 392 | |
f3ed775e | 393 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
d9800920 | 394 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
f3ed775e | 395 | if (ret < 0) { |
7a485870 | 396 | goto error; |
f3ed775e DG |
397 | } |
398 | } | |
399 | ||
7a485870 DG |
400 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
401 | ||
f3ed775e DG |
402 | return 0; |
403 | ||
404 | error: | |
405 | return ret; | |
406 | } | |
407 | ||
97b1a726 | 408 | #ifdef DISABLED |
fac6795d | 409 | /* |
d063d709 DG |
410 | * Return a socket connected to the libust communication socket of the |
411 | * application identified by the pid. | |
fac6795d | 412 | * |
d063d709 | 413 | * If the pid is not found in the traceable list, return -1 to indicate error. |
fac6795d | 414 | */ |
471d1693 | 415 | static int ust_connect_app(pid_t pid) |
fac6795d | 416 | { |
91d76f53 DG |
417 | int sock; |
418 | struct ltt_traceable_app *lta; | |
379473d2 | 419 | |
e07ae692 DG |
420 | DBG("Connect to application pid %d", pid); |
421 | ||
91d76f53 DG |
422 | lta = find_app_by_pid(pid); |
423 | if (lta == NULL) { | |
424 | /* App not found */ | |
7442b2ba | 425 | DBG("Application pid %d not found", pid); |
379473d2 DG |
426 | return -1; |
427 | } | |
fac6795d | 428 | |
91d76f53 | 429 | sock = ustctl_connect_pid(lta->pid); |
fac6795d | 430 | if (sock < 0) { |
62d3069f | 431 | ERR("Fail connecting to the PID %d", pid); |
fac6795d DG |
432 | } |
433 | ||
434 | return sock; | |
435 | } | |
436 | ||
437 | /* | |
d063d709 DG |
438 | * Notify apps by writing 42 to a named pipe using name. Every applications |
439 | * waiting for a ltt-sessiond will be notified and re-register automatically to | |
440 | * the session daemon. | |
fac6795d | 441 | * |
d063d709 | 442 | * Return open or write error value. |
fac6795d DG |
443 | */ |
444 | static int notify_apps(const char *name) | |
445 | { | |
446 | int fd; | |
447 | int ret = -1; | |
448 | ||
e07ae692 DG |
449 | DBG("Notify the global application pipe"); |
450 | ||
fac6795d DG |
451 | /* Try opening the global pipe */ |
452 | fd = open(name, O_WRONLY); | |
453 | if (fd < 0) { | |
454 | goto error; | |
455 | } | |
456 | ||
457 | /* Notify by writing on the pipe */ | |
458 | ret = write(fd, "42", 2); | |
459 | if (ret < 0) { | |
460 | perror("write"); | |
461 | } | |
462 | ||
463 | error: | |
464 | return ret; | |
465 | } | |
099e26bd | 466 | #endif /* DISABLED */ |
fac6795d | 467 | |
e065084a | 468 | /* |
d063d709 DG |
469 | * Setup the outgoing data buffer for the response (llm) by allocating the |
470 | * right amount of memory and copying the original information from the lsm | |
471 | * structure. | |
ca95a216 | 472 | * |
d063d709 | 473 | * Return total size of the buffer pointed by buf. |
ca95a216 | 474 | */ |
5461b305 | 475 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
ca95a216 | 476 | { |
f3ed775e | 477 | int ret, buf_size; |
ca95a216 | 478 | |
f3ed775e | 479 | buf_size = size; |
5461b305 DG |
480 | |
481 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); | |
482 | if (cmd_ctx->llm == NULL) { | |
ca95a216 | 483 | perror("malloc"); |
5461b305 | 484 | ret = -ENOMEM; |
ca95a216 DG |
485 | goto error; |
486 | } | |
487 | ||
5461b305 DG |
488 | /* Copy common data */ |
489 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; | |
9f19cc17 | 490 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
5461b305 | 491 | |
5461b305 DG |
492 | cmd_ctx->llm->data_size = size; |
493 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; | |
494 | ||
ca95a216 DG |
495 | return buf_size; |
496 | ||
497 | error: | |
498 | return ret; | |
499 | } | |
500 | ||
7a485870 | 501 | /* |
d063d709 DG |
502 | * Update the kernel pollfd set of all channel fd available over all tracing |
503 | * session. Add the wakeup pipe at the end of the set. | |
7a485870 DG |
504 | */ |
505 | static int update_kernel_pollfd(void) | |
506 | { | |
507 | int i = 0; | |
273ea72c DG |
508 | /* |
509 | * The wakup pipe and the quit pipe are needed so the number of fds starts | |
510 | * at 2 for those pipes. | |
511 | */ | |
512 | unsigned int nb_fd = 2; | |
7a485870 DG |
513 | struct ltt_session *session; |
514 | struct ltt_kernel_channel *channel; | |
515 | ||
516 | DBG("Updating kernel_pollfd"); | |
517 | ||
518 | /* Get the number of channel of all kernel session */ | |
6c9cc2ab | 519 | lock_session_list(); |
b5541356 DG |
520 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
521 | lock_session(session); | |
7a485870 | 522 | if (session->kernel_session == NULL) { |
b5541356 | 523 | unlock_session(session); |
7a485870 DG |
524 | continue; |
525 | } | |
526 | nb_fd += session->kernel_session->channel_count; | |
b5541356 | 527 | unlock_session(session); |
7a485870 DG |
528 | } |
529 | ||
530 | DBG("Resizing kernel_pollfd to size %d", nb_fd); | |
531 | ||
532 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); | |
533 | if (kernel_pollfd == NULL) { | |
534 | perror("malloc kernel_pollfd"); | |
535 | goto error; | |
536 | } | |
537 | ||
b5541356 DG |
538 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
539 | lock_session(session); | |
7a485870 | 540 | if (session->kernel_session == NULL) { |
b5541356 | 541 | unlock_session(session); |
7a485870 DG |
542 | continue; |
543 | } | |
544 | if (i >= nb_fd) { | |
545 | ERR("To much channel for kernel_pollfd size"); | |
b5541356 | 546 | unlock_session(session); |
7a485870 DG |
547 | break; |
548 | } | |
549 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { | |
550 | kernel_pollfd[i].fd = channel->fd; | |
551 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; | |
552 | i++; | |
553 | } | |
b5541356 | 554 | unlock_session(session); |
7a485870 | 555 | } |
6c9cc2ab | 556 | unlock_session_list(); |
7a485870 DG |
557 | |
558 | /* Adding wake up pipe */ | |
273ea72c DG |
559 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
560 | kernel_pollfd[nb_fd - 2].events = POLLIN; | |
561 | ||
562 | /* Adding the quit pipe */ | |
563 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; | |
7a485870 DG |
564 | |
565 | return nb_fd; | |
566 | ||
567 | error: | |
6c9cc2ab | 568 | unlock_session_list(); |
7a485870 DG |
569 | return -1; |
570 | } | |
571 | ||
572 | /* | |
d063d709 DG |
573 | * Find the channel fd from 'fd' over all tracing session. When found, check |
574 | * for new channel stream and send those stream fds to the kernel consumer. | |
7a485870 | 575 | * |
d063d709 | 576 | * Useful for CPU hotplug feature. |
7a485870 DG |
577 | */ |
578 | static int update_kernel_stream(int fd) | |
579 | { | |
580 | int ret = 0; | |
581 | struct ltt_session *session; | |
582 | struct ltt_kernel_channel *channel; | |
583 | ||
584 | DBG("Updating kernel streams for channel fd %d", fd); | |
585 | ||
6c9cc2ab | 586 | lock_session_list(); |
b5541356 DG |
587 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
588 | lock_session(session); | |
7a485870 | 589 | if (session->kernel_session == NULL) { |
b5541356 | 590 | unlock_session(session); |
7a485870 DG |
591 | continue; |
592 | } | |
d9800920 DG |
593 | |
594 | /* This is not suppose to be 0 but this is an extra security check */ | |
595 | if (session->kernel_session->consumer_fd == 0) { | |
596 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
597 | } | |
598 | ||
7a485870 DG |
599 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
600 | if (channel->fd == fd) { | |
601 | DBG("Channel found, updating kernel streams"); | |
602 | ret = kernel_open_channel_stream(channel); | |
603 | if (ret < 0) { | |
604 | goto end; | |
605 | } | |
d9800920 | 606 | |
7a485870 DG |
607 | /* |
608 | * Have we already sent fds to the consumer? If yes, it means that | |
609 | * tracing is started so it is safe to send our updated stream fds. | |
610 | */ | |
611 | if (session->kernel_session->kconsumer_fds_sent == 1) { | |
d9800920 DG |
612 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
613 | channel); | |
7a485870 DG |
614 | if (ret < 0) { |
615 | goto end; | |
616 | } | |
617 | } | |
618 | goto end; | |
619 | } | |
620 | } | |
b5541356 | 621 | unlock_session(session); |
7a485870 DG |
622 | } |
623 | ||
624 | end: | |
6c9cc2ab | 625 | unlock_session_list(); |
b5541356 DG |
626 | if (session) { |
627 | unlock_session(session); | |
628 | } | |
7a485870 DG |
629 | return ret; |
630 | } | |
631 | ||
632 | /* | |
d063d709 | 633 | * This thread manage event coming from the kernel. |
7a485870 | 634 | * |
d063d709 DG |
635 | * Features supported in this thread: |
636 | * -) CPU Hotplug | |
7a485870 DG |
637 | */ |
638 | static void *thread_manage_kernel(void *data) | |
639 | { | |
640 | int ret, i, nb_fd = 0; | |
641 | char tmp; | |
642 | int update_poll_flag = 1; | |
643 | ||
644 | DBG("Thread manage kernel started"); | |
645 | ||
646 | while (1) { | |
647 | if (update_poll_flag == 1) { | |
648 | nb_fd = update_kernel_pollfd(); | |
649 | if (nb_fd < 0) { | |
650 | goto error; | |
651 | } | |
652 | update_poll_flag = 0; | |
653 | } | |
654 | ||
655 | DBG("Polling on %d fds", nb_fd); | |
656 | ||
657 | /* Poll infinite value of time */ | |
658 | ret = poll(kernel_pollfd, nb_fd, -1); | |
659 | if (ret < 0) { | |
660 | perror("poll kernel thread"); | |
661 | goto error; | |
662 | } else if (ret == 0) { | |
663 | /* Should not happen since timeout is infinite */ | |
664 | continue; | |
665 | } | |
666 | ||
273ea72c DG |
667 | /* Thread quit pipe has been closed. Killing thread. */ |
668 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { | |
669 | goto error; | |
670 | } | |
671 | ||
7a485870 DG |
672 | DBG("Kernel poll event triggered"); |
673 | ||
674 | /* | |
675 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd | |
676 | * must be updated. | |
677 | */ | |
273ea72c | 678 | switch (kernel_pollfd[nb_fd - 2].revents) { |
b5541356 | 679 | case POLLIN: |
7a485870 DG |
680 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
681 | update_poll_flag = 1; | |
682 | continue; | |
b5541356 DG |
683 | case POLLERR: |
684 | goto error; | |
685 | default: | |
686 | break; | |
7a485870 DG |
687 | } |
688 | ||
689 | for (i = 0; i < nb_fd; i++) { | |
690 | switch (kernel_pollfd[i].revents) { | |
691 | /* | |
692 | * New CPU detected by the kernel. Adding kernel stream to kernel | |
693 | * session and updating the kernel consumer | |
694 | */ | |
695 | case POLLIN | POLLRDNORM: | |
696 | ret = update_kernel_stream(kernel_pollfd[i].fd); | |
697 | if (ret < 0) { | |
698 | continue; | |
699 | } | |
700 | break; | |
701 | } | |
702 | } | |
703 | } | |
704 | ||
705 | error: | |
706 | DBG("Kernel thread dying"); | |
707 | if (kernel_pollfd) { | |
708 | free(kernel_pollfd); | |
709 | } | |
273ea72c DG |
710 | |
711 | close(kernel_poll_pipe[0]); | |
712 | close(kernel_poll_pipe[1]); | |
7a485870 DG |
713 | return NULL; |
714 | } | |
715 | ||
1d4b027a | 716 | /* |
d063d709 | 717 | * This thread manage the kconsumerd error sent back to the session daemon. |
1d4b027a DG |
718 | */ |
719 | static void *thread_manage_kconsumerd(void *data) | |
720 | { | |
273ea72c | 721 | int sock = 0, ret; |
1d4b027a | 722 | enum lttcomm_return_code code; |
273ea72c | 723 | struct pollfd pollfd[2]; |
1d4b027a DG |
724 | |
725 | DBG("[thread] Manage kconsumerd started"); | |
726 | ||
727 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); | |
728 | if (ret < 0) { | |
729 | goto error; | |
730 | } | |
731 | ||
273ea72c DG |
732 | /* First fd is always the quit pipe */ |
733 | pollfd[0].fd = thread_quit_pipe[0]; | |
734 | ||
735 | /* Apps socket */ | |
736 | pollfd[1].fd = kconsumerd_err_sock; | |
737 | pollfd[1].events = POLLIN; | |
738 | ||
739 | /* Inifinite blocking call, waiting for transmission */ | |
740 | ret = poll(pollfd, 2, -1); | |
741 | if (ret < 0) { | |
742 | perror("poll kconsumerd thread"); | |
743 | goto error; | |
744 | } | |
745 | ||
746 | /* Thread quit pipe has been closed. Killing thread. */ | |
747 | if (pollfd[0].revents == POLLNVAL) { | |
748 | goto error; | |
749 | } else if (pollfd[1].revents == POLLERR) { | |
750 | ERR("Kconsumerd err socket poll error"); | |
751 | goto error; | |
752 | } | |
753 | ||
1d4b027a DG |
754 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
755 | if (sock < 0) { | |
756 | goto error; | |
757 | } | |
758 | ||
712ea556 | 759 | /* Getting status code from kconsumerd */ |
1d4b027a DG |
760 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
761 | if (ret <= 0) { | |
762 | goto error; | |
763 | } | |
764 | ||
765 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { | |
766 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); | |
767 | if (kconsumerd_cmd_sock < 0) { | |
712ea556 | 768 | sem_post(&kconsumerd_sem); |
1d4b027a DG |
769 | perror("kconsumerd connect"); |
770 | goto error; | |
771 | } | |
772 | /* Signal condition to tell that the kconsumerd is ready */ | |
773 | sem_post(&kconsumerd_sem); | |
774 | DBG("Kconsumerd command socket ready"); | |
775 | } else { | |
6f61d021 | 776 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
1d4b027a DG |
777 | lttcomm_get_readable_code(-code)); |
778 | goto error; | |
779 | } | |
780 | ||
72079cae DG |
781 | /* Kconsumerd err socket */ |
782 | pollfd[1].fd = sock; | |
783 | pollfd[1].events = POLLIN; | |
784 | ||
785 | /* Inifinite blocking call, waiting for transmission */ | |
786 | ret = poll(pollfd, 2, -1); | |
787 | if (ret < 0) { | |
788 | perror("poll kconsumerd thread"); | |
789 | goto error; | |
790 | } | |
791 | ||
792 | /* Thread quit pipe has been closed. Killing thread. */ | |
793 | if (pollfd[0].revents == POLLNVAL) { | |
794 | goto error; | |
795 | } else if (pollfd[1].revents == POLLERR) { | |
796 | ERR("Kconsumerd err socket second poll error"); | |
797 | goto error; | |
798 | } | |
799 | ||
712ea556 DG |
800 | /* Wait for any kconsumerd error */ |
801 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); | |
802 | if (ret <= 0) { | |
803 | ERR("Kconsumerd closed the command socket"); | |
804 | goto error; | |
6f61d021 | 805 | } |
1d4b027a | 806 | |
712ea556 DG |
807 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
808 | ||
1d4b027a | 809 | error: |
6f61d021 | 810 | DBG("Kconsumerd thread dying"); |
273ea72c DG |
811 | if (kconsumerd_err_sock) { |
812 | close(kconsumerd_err_sock); | |
813 | } | |
814 | if (kconsumerd_cmd_sock) { | |
815 | close(kconsumerd_cmd_sock); | |
816 | } | |
817 | if (sock) { | |
818 | close(sock); | |
819 | } | |
820 | ||
821 | unlink(kconsumerd_err_unix_sock_path); | |
822 | unlink(kconsumerd_cmd_unix_sock_path); | |
823 | ||
824 | kconsumerd_pid = 0; | |
1d4b027a DG |
825 | return NULL; |
826 | } | |
827 | ||
828 | /* | |
099e26bd DG |
829 | * Reallocate the apps command pollfd structure of nb_fd size. |
830 | * | |
831 | * The first two fds must be there at all time. | |
832 | */ | |
833 | static int update_apps_cmd_pollfd(unsigned int nb_fd, struct pollfd **pollfd) | |
834 | { | |
835 | /* Can't accept pollfd less than 2 */ | |
836 | if (nb_fd < 2) { | |
837 | goto end; | |
838 | } | |
839 | ||
840 | *pollfd = realloc(*pollfd, nb_fd * sizeof(struct pollfd)); | |
841 | if (*pollfd == NULL) { | |
842 | perror("realloc manage apps pollfd"); | |
843 | goto error; | |
844 | } | |
845 | ||
846 | /* First fd is always the quit pipe */ | |
847 | (*pollfd)[0].fd = thread_quit_pipe[0]; | |
848 | /* Apps command pipe */ | |
849 | (*pollfd)[1].fd = apps_cmd_pipe[0]; | |
850 | (*pollfd)[1].events = POLLIN; | |
851 | ||
852 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); | |
853 | ||
854 | end: | |
855 | return 0; | |
856 | ||
857 | error: | |
858 | return -1; | |
859 | } | |
860 | ||
861 | /* | |
862 | * Send registration done packet to the application. | |
863 | */ | |
864 | static int send_ust_register_done(int sock) | |
865 | { | |
866 | struct lttcomm_ust_msg lum; | |
867 | ||
868 | DBG("Sending register done command to %d", sock); | |
869 | ||
870 | lum.cmd = LTTNG_UST_REGISTER_DONE; | |
871 | lum.handle = LTTNG_UST_ROOT_HANDLE; | |
872 | ||
873 | return ustcomm_send_command(sock, &lum); | |
874 | } | |
875 | ||
876 | /* | |
877 | * This thread manage application communication. | |
1d4b027a DG |
878 | */ |
879 | static void *thread_manage_apps(void *data) | |
099e26bd DG |
880 | { |
881 | int i, ret, count; | |
882 | unsigned int nb_fd = 2; | |
883 | int update_poll_flag = 1; | |
884 | struct pollfd *pollfd = NULL; | |
885 | struct ust_command ust_cmd; | |
886 | ||
887 | DBG("[thread] Manage application started"); | |
888 | ||
889 | ust_cmd.sock = -1; | |
890 | ||
891 | while (1) { | |
892 | /* See if we have a valid socket to add to pollfd */ | |
893 | if (ust_cmd.sock != -1) { | |
894 | nb_fd++; | |
895 | update_poll_flag = 1; | |
896 | } | |
897 | ||
898 | /* The pollfd struct must be updated */ | |
899 | if (update_poll_flag) { | |
900 | ret = update_apps_cmd_pollfd(nb_fd, &pollfd); | |
901 | if (ret < 0) { | |
902 | /* malloc failed so we quit */ | |
903 | goto error; | |
904 | } | |
905 | if (ust_cmd.sock != -1) { | |
906 | /* Update pollfd with the new UST socket */ | |
907 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); | |
908 | pollfd[nb_fd - 1].fd = ust_cmd.sock; | |
909 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL; | |
910 | ust_cmd.sock = -1; | |
911 | } | |
912 | } | |
913 | ||
914 | DBG("Apps thread polling on %d fds", nb_fd); | |
915 | ||
916 | /* Inifinite blocking call, waiting for transmission */ | |
917 | ret = poll(pollfd, nb_fd, -1); | |
918 | if (ret < 0) { | |
919 | perror("poll apps thread"); | |
920 | goto error; | |
921 | } | |
922 | ||
923 | /* Thread quit pipe has been closed. Killing thread. */ | |
924 | if (pollfd[0].revents == POLLNVAL) { | |
925 | goto error; | |
926 | } else if (pollfd[1].revents == POLLERR) { | |
927 | ERR("Apps command pipe poll error"); | |
928 | goto error; | |
929 | } else if (pollfd[1].revents == POLLIN) { | |
930 | /* Empty pipe */ | |
931 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); | |
932 | if (ret < 0 || ret < sizeof(ust_cmd)) { | |
933 | perror("read apps cmd pipe"); | |
934 | goto error; | |
935 | } | |
936 | ||
937 | /* Register applicaton to the session daemon */ | |
938 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); | |
939 | if (ret < 0) { | |
940 | /* Only critical ENOMEM error can be returned here */ | |
941 | goto error; | |
942 | } | |
943 | ||
944 | ret = send_ust_register_done(ust_cmd.sock); | |
945 | if (ret < 0) { | |
946 | /* | |
947 | * If the registration is not possible, we simply unregister | |
948 | * the apps and continue | |
949 | */ | |
950 | unregister_traceable_app(ust_cmd.sock); | |
951 | } | |
952 | } | |
953 | ||
954 | count = nb_fd; | |
955 | for (i = 2; i < count; i++) { | |
956 | /* Apps socket is closed/hungup */ | |
957 | switch (pollfd[i].revents) { | |
958 | case POLLNVAL: | |
959 | case POLLHUP: | |
960 | /* Pipe closed */ | |
961 | unregister_traceable_app(pollfd[i].fd); | |
962 | nb_fd--; | |
963 | } | |
964 | } | |
965 | ||
966 | if (nb_fd != count) { | |
967 | update_poll_flag = 1; | |
968 | } | |
969 | } | |
970 | ||
971 | error: | |
972 | DBG("Application communication apps dying"); | |
973 | close(apps_cmd_pipe[0]); | |
974 | close(apps_cmd_pipe[1]); | |
975 | ||
976 | free(pollfd); | |
977 | ||
978 | return NULL; | |
979 | } | |
980 | ||
981 | /* | |
982 | * Dispatch request from the registration threads to the application | |
983 | * communication thread. | |
984 | */ | |
985 | static void *thread_dispatch_ust_registration(void *data) | |
986 | { | |
987 | int ret; | |
988 | struct cds_wfq_node *node; | |
989 | struct ust_command *ust_cmd = NULL; | |
990 | ||
991 | DBG("[thread] Dispatch UST command started"); | |
992 | ||
993 | while (!dispatch_thread_exit) { | |
994 | /* Atomically prepare the queue futex */ | |
995 | futex_nto1_prepare(&ust_cmd_queue.futex); | |
996 | ||
997 | do { | |
998 | /* Dequeue command for registration */ | |
999 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); | |
1000 | if (node == NULL) { | |
1001 | DBG("Waked up but nothing in the UST command queue"); | |
1002 | /* Continue thread execution */ | |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | ust_cmd = caa_container_of(node, struct ust_command, node); | |
1007 | ||
2f50c8a3 DG |
1008 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
1009 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1010 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1011 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1012 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1013 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1014 | /* |
1015 | * Inform apps thread of the new application registration. This | |
1016 | * call is blocking so we can be assured that the data will be read | |
1017 | * at some point in time or wait to the end of the world :) | |
1018 | */ | |
1019 | ret = write(apps_cmd_pipe[1], ust_cmd, | |
1020 | sizeof(struct ust_command)); | |
1021 | if (ret < 0) { | |
1022 | perror("write apps cmd pipe"); | |
1023 | if (errno == EBADF) { | |
1024 | /* | |
1025 | * We can't inform the application thread to process | |
1026 | * registration. We will exit or else application | |
1027 | * registration will not occur and tracing will never | |
1028 | * start. | |
1029 | */ | |
1030 | goto error; | |
1031 | } | |
1032 | } | |
1033 | free(ust_cmd); | |
1034 | } while (node != NULL); | |
1035 | ||
1036 | /* Futex wait on queue. Blocking call on futex() */ | |
1037 | futex_nto1_wait(&ust_cmd_queue.futex); | |
1038 | } | |
1039 | ||
1040 | error: | |
1041 | DBG("Dispatch thread dying"); | |
1042 | return NULL; | |
1043 | } | |
1044 | ||
1045 | /* | |
1046 | * This thread manage application registration. | |
1047 | */ | |
1048 | static void *thread_registration_apps(void *data) | |
1d4b027a | 1049 | { |
273ea72c DG |
1050 | int sock = 0, ret; |
1051 | struct pollfd pollfd[2]; | |
099e26bd DG |
1052 | /* |
1053 | * Get allocated in this thread, enqueued to a global queue, dequeued and | |
1054 | * freed in the manage apps thread. | |
1055 | */ | |
1056 | struct ust_command *ust_cmd = NULL; | |
1d4b027a | 1057 | |
099e26bd | 1058 | DBG("[thread] Manage application registration started"); |
1d4b027a DG |
1059 | |
1060 | ret = lttcomm_listen_unix_sock(apps_sock); | |
1061 | if (ret < 0) { | |
1062 | goto error; | |
1063 | } | |
1064 | ||
273ea72c DG |
1065 | /* First fd is always the quit pipe */ |
1066 | pollfd[0].fd = thread_quit_pipe[0]; | |
1067 | ||
1068 | /* Apps socket */ | |
1069 | pollfd[1].fd = apps_sock; | |
1070 | pollfd[1].events = POLLIN; | |
1071 | ||
1d4b027a | 1072 | /* Notify all applications to register */ |
099e26bd | 1073 | //notify_apps(default_global_apps_pipe); |
1d4b027a DG |
1074 | |
1075 | while (1) { | |
1076 | DBG("Accepting application registration"); | |
273ea72c DG |
1077 | |
1078 | /* Inifinite blocking call, waiting for transmission */ | |
1079 | ret = poll(pollfd, 2, -1); | |
1080 | if (ret < 0) { | |
099e26bd | 1081 | perror("poll register apps thread"); |
273ea72c DG |
1082 | goto error; |
1083 | } | |
1084 | ||
1085 | /* Thread quit pipe has been closed. Killing thread. */ | |
1086 | if (pollfd[0].revents == POLLNVAL) { | |
1087 | goto error; | |
1088 | } else if (pollfd[1].revents == POLLERR) { | |
099e26bd | 1089 | ERR("Register apps socket poll error"); |
273ea72c DG |
1090 | goto error; |
1091 | } | |
1092 | ||
1d4b027a DG |
1093 | sock = lttcomm_accept_unix_sock(apps_sock); |
1094 | if (sock < 0) { | |
1095 | goto error; | |
1096 | } | |
1097 | ||
099e26bd DG |
1098 | /* Create UST registration command for enqueuing */ |
1099 | ust_cmd = malloc(sizeof(struct ust_command)); | |
1100 | if (ust_cmd == NULL) { | |
1101 | perror("ust command malloc"); | |
1102 | goto error; | |
1103 | } | |
1104 | ||
273ea72c | 1105 | /* |
099e26bd DG |
1106 | * Using message-based transmissions to ensure we don't have to deal |
1107 | * with partially received messages. | |
1d4b027a | 1108 | */ |
099e26bd DG |
1109 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
1110 | sizeof(struct ust_register_msg)); | |
2f50c8a3 DG |
1111 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
1112 | if (ret < 0) { | |
1113 | perror("lttcomm_recv_unix_sock register apps"); | |
1114 | } else { | |
1115 | ERR("Wrong size received on apps register"); | |
1116 | } | |
099e26bd DG |
1117 | free(ust_cmd); |
1118 | close(sock); | |
1d4b027a DG |
1119 | continue; |
1120 | } | |
1121 | ||
099e26bd DG |
1122 | ust_cmd->sock = sock; |
1123 | ||
2f50c8a3 DG |
1124 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
1125 | " gid:%d sock:%d name:%s (version %d.%d)", | |
1126 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, | |
1127 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, | |
1128 | ust_cmd->sock, ust_cmd->reg_msg.name, | |
1129 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); | |
099e26bd DG |
1130 | /* |
1131 | * Lock free enqueue the registration request. | |
1132 | * The red pill has been taken! This apps will be part of the *system* | |
1133 | */ | |
1134 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); | |
1135 | ||
1136 | /* | |
1137 | * Wake the registration queue futex. | |
1138 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. | |
1139 | */ | |
1140 | futex_nto1_wake(&ust_cmd_queue.futex); | |
1d4b027a DG |
1141 | } |
1142 | ||
1143 | error: | |
099e26bd | 1144 | DBG("Register apps thread dying"); |
273ea72c DG |
1145 | if (apps_sock) { |
1146 | close(apps_sock); | |
1147 | } | |
1148 | if (sock) { | |
1149 | close(sock); | |
1150 | } | |
1d4b027a | 1151 | |
273ea72c | 1152 | unlink(apps_unix_sock_path); |
1d4b027a DG |
1153 | return NULL; |
1154 | } | |
1155 | ||
8c0faa1d | 1156 | /* |
d063d709 DG |
1157 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
1158 | * exec or it will fails. | |
8c0faa1d | 1159 | */ |
693bd40b | 1160 | static int spawn_kconsumerd_thread(void) |
8c0faa1d DG |
1161 | { |
1162 | int ret; | |
1163 | ||
1164 | /* Setup semaphore */ | |
1165 | sem_init(&kconsumerd_sem, 0, 0); | |
1166 | ||
1d4b027a | 1167 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
8c0faa1d DG |
1168 | if (ret != 0) { |
1169 | perror("pthread_create kconsumerd"); | |
1170 | goto error; | |
1171 | } | |
1172 | ||
693bd40b | 1173 | /* Wait for the kconsumerd thread to be ready */ |
8c0faa1d DG |
1174 | sem_wait(&kconsumerd_sem); |
1175 | ||
712ea556 DG |
1176 | if (kconsumerd_pid == 0) { |
1177 | ERR("Kconsumerd did not start"); | |
1178 | goto error; | |
1179 | } | |
1180 | ||
8c0faa1d DG |
1181 | return 0; |
1182 | ||
1183 | error: | |
712ea556 | 1184 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
8c0faa1d DG |
1185 | return ret; |
1186 | } | |
1187 | ||
d9800920 DG |
1188 | /* |
1189 | * Join kernel consumer thread | |
1190 | */ | |
cf3af59e MD |
1191 | static int join_kconsumerd_thread(void) |
1192 | { | |
1193 | void *status; | |
1194 | int ret; | |
1195 | ||
1196 | if (kconsumerd_pid != 0) { | |
1197 | ret = kill(kconsumerd_pid, SIGTERM); | |
1198 | if (ret) { | |
1199 | ERR("Error killing kconsumerd"); | |
1200 | return ret; | |
1201 | } | |
1202 | return pthread_join(kconsumerd_thread, &status); | |
1203 | } else { | |
1204 | return 0; | |
1205 | } | |
1206 | } | |
1207 | ||
8c0faa1d | 1208 | /* |
d063d709 | 1209 | * Fork and exec a kernel consumer daemon (kconsumerd). |
8c0faa1d | 1210 | * |
d063d709 | 1211 | * Return pid if successful else -1. |
8c0faa1d | 1212 | */ |
693bd40b | 1213 | static pid_t spawn_kconsumerd(void) |
8c0faa1d DG |
1214 | { |
1215 | int ret; | |
1216 | pid_t pid; | |
53086306 | 1217 | const char *verbosity; |
8c0faa1d | 1218 | |
c49dc785 DG |
1219 | DBG("Spawning kconsumerd"); |
1220 | ||
8c0faa1d DG |
1221 | pid = fork(); |
1222 | if (pid == 0) { | |
1223 | /* | |
1224 | * Exec kconsumerd. | |
1225 | */ | |
31f73cc9 | 1226 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
53086306 DG |
1227 | verbosity = "--verbose"; |
1228 | } else { | |
1229 | verbosity = "--quiet"; | |
1230 | } | |
1231 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); | |
8c0faa1d DG |
1232 | if (errno != 0) { |
1233 | perror("kernel start consumer exec"); | |
1234 | } | |
1235 | exit(EXIT_FAILURE); | |
1236 | } else if (pid > 0) { | |
1237 | ret = pid; | |
1238 | goto error; | |
1239 | } else { | |
1240 | perror("kernel start consumer fork"); | |
1241 | ret = -errno; | |
1242 | goto error; | |
1243 | } | |
1244 | ||
1245 | error: | |
1246 | return ret; | |
1247 | } | |
1248 | ||
693bd40b | 1249 | /* |
d063d709 | 1250 | * Spawn the kconsumerd daemon and session daemon thread. |
693bd40b DG |
1251 | */ |
1252 | static int start_kconsumerd(void) | |
1253 | { | |
1254 | int ret; | |
1255 | ||
693bd40b | 1256 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
c49dc785 | 1257 | if (kconsumerd_pid != 0) { |
817153bb | 1258 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
c49dc785 DG |
1259 | goto end; |
1260 | } | |
693bd40b | 1261 | |
c49dc785 DG |
1262 | ret = spawn_kconsumerd(); |
1263 | if (ret < 0) { | |
1264 | ERR("Spawning kconsumerd failed"); | |
1265 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1266 | pthread_mutex_unlock(&kconsumerd_pid_mutex); | |
1267 | goto error; | |
693bd40b | 1268 | } |
c49dc785 DG |
1269 | |
1270 | /* Setting up the global kconsumerd_pid */ | |
1271 | kconsumerd_pid = ret; | |
693bd40b DG |
1272 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
1273 | ||
6f61d021 DG |
1274 | DBG("Kconsumerd pid %d", ret); |
1275 | ||
693bd40b | 1276 | DBG("Spawning kconsumerd thread"); |
693bd40b DG |
1277 | ret = spawn_kconsumerd_thread(); |
1278 | if (ret < 0) { | |
1279 | ERR("Fatal error spawning kconsumerd thread"); | |
693bd40b DG |
1280 | goto error; |
1281 | } | |
1282 | ||
c49dc785 | 1283 | end: |
693bd40b DG |
1284 | return 0; |
1285 | ||
1286 | error: | |
1287 | return ret; | |
1288 | } | |
1289 | ||
b73401da | 1290 | /* |
d063d709 | 1291 | * modprobe_kernel_modules |
b73401da DG |
1292 | */ |
1293 | static int modprobe_kernel_modules(void) | |
1294 | { | |
ab147185 | 1295 | int ret = 0, i; |
b73401da DG |
1296 | char modprobe[256]; |
1297 | ||
ab147185 MD |
1298 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
1299 | ret = snprintf(modprobe, sizeof(modprobe), | |
1300 | "/sbin/modprobe %s%s", | |
1301 | kernel_modules_list[i].required ? "" : "--quiet ", | |
1302 | kernel_modules_list[i].name); | |
b73401da DG |
1303 | if (ret < 0) { |
1304 | perror("snprintf modprobe"); | |
1305 | goto error; | |
1306 | } | |
ab147185 | 1307 | modprobe[sizeof(modprobe) - 1] = '\0'; |
b73401da | 1308 | ret = system(modprobe); |
ab147185 MD |
1309 | if (ret == -1) { |
1310 | ERR("Unable to launch modprobe for module %s", | |
1311 | kernel_modules_list[i].name); | |
1312 | } else if (kernel_modules_list[i].required | |
d9800920 | 1313 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1314 | ERR("Unable to load module %s", |
1315 | kernel_modules_list[i].name); | |
1316 | } else { | |
1317 | DBG("Modprobe successfully %s", | |
1318 | kernel_modules_list[i].name); | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | error: | |
1323 | return ret; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * modprobe_remove_kernel_modules | |
1328 | * Remove modules in reverse load order. | |
1329 | */ | |
1330 | static int modprobe_remove_kernel_modules(void) | |
1331 | { | |
1332 | int ret = 0, i; | |
1333 | char modprobe[256]; | |
1334 | ||
1335 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { | |
1336 | ret = snprintf(modprobe, sizeof(modprobe), | |
1337 | "/sbin/modprobe --remove --quiet %s", | |
1338 | kernel_modules_list[i].name); | |
b73401da | 1339 | if (ret < 0) { |
ab147185 MD |
1340 | perror("snprintf modprobe --remove"); |
1341 | goto error; | |
1342 | } | |
1343 | modprobe[sizeof(modprobe) - 1] = '\0'; | |
1344 | ret = system(modprobe); | |
1345 | if (ret == -1) { | |
1346 | ERR("Unable to launch modprobe --remove for module %s", | |
1347 | kernel_modules_list[i].name); | |
1348 | } else if (kernel_modules_list[i].required | |
d9800920 | 1349 | && WEXITSTATUS(ret) != 0) { |
ab147185 MD |
1350 | ERR("Unable to remove module %s", |
1351 | kernel_modules_list[i].name); | |
1352 | } else { | |
1353 | DBG("Modprobe removal successful %s", | |
1354 | kernel_modules_list[i].name); | |
b73401da | 1355 | } |
b73401da DG |
1356 | } |
1357 | ||
1358 | error: | |
1359 | return ret; | |
1360 | } | |
1361 | ||
1362 | /* | |
d063d709 | 1363 | * mount_debugfs |
b73401da DG |
1364 | */ |
1365 | static int mount_debugfs(char *path) | |
1366 | { | |
1367 | int ret; | |
1368 | char *type = "debugfs"; | |
1369 | ||
996b65c8 | 1370 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
b73401da DG |
1371 | if (ret < 0) { |
1372 | goto error; | |
1373 | } | |
1374 | ||
1375 | ret = mount(type, path, type, 0, NULL); | |
1376 | if (ret < 0) { | |
1377 | perror("mount debugfs"); | |
1378 | goto error; | |
1379 | } | |
1380 | ||
1381 | DBG("Mounted debugfs successfully at %s", path); | |
1382 | ||
1383 | error: | |
1384 | return ret; | |
1385 | } | |
1386 | ||
8c0faa1d | 1387 | /* |
d063d709 | 1388 | * Setup necessary data for kernel tracer action. |
8c0faa1d | 1389 | */ |
f3ed775e | 1390 | static void init_kernel_tracer(void) |
8c0faa1d | 1391 | { |
b73401da DG |
1392 | int ret; |
1393 | char *proc_mounts = "/proc/mounts"; | |
1394 | char line[256]; | |
1395 | char *debugfs_path = NULL, *lttng_path; | |
1396 | FILE *fp; | |
1397 | ||
1398 | /* Detect debugfs */ | |
1399 | fp = fopen(proc_mounts, "r"); | |
1400 | if (fp == NULL) { | |
1401 | ERR("Unable to probe %s", proc_mounts); | |
1402 | goto error; | |
1403 | } | |
1404 | ||
1405 | while (fgets(line, sizeof(line), fp) != NULL) { | |
1406 | if (strstr(line, "debugfs") != NULL) { | |
1407 | /* Remove first string */ | |
1408 | strtok(line, " "); | |
1409 | /* Dup string here so we can reuse line later on */ | |
1410 | debugfs_path = strdup(strtok(NULL, " ")); | |
1411 | DBG("Got debugfs path : %s", debugfs_path); | |
1412 | break; | |
1413 | } | |
1414 | } | |
1415 | ||
1416 | fclose(fp); | |
1417 | ||
1418 | /* Mount debugfs if needded */ | |
1419 | if (debugfs_path == NULL) { | |
1420 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); | |
1421 | if (ret < 0) { | |
1422 | perror("asprintf debugfs path"); | |
1423 | goto error; | |
1424 | } | |
1425 | ret = mount_debugfs(debugfs_path); | |
1426 | if (ret < 0) { | |
1427 | goto error; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | /* Modprobe lttng kernel modules */ | |
1432 | ret = modprobe_kernel_modules(); | |
1433 | if (ret < 0) { | |
1434 | goto error; | |
1435 | } | |
1436 | ||
1437 | /* Setup lttng kernel path */ | |
1438 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); | |
1439 | if (ret < 0) { | |
1440 | perror("asprintf lttng path"); | |
1441 | goto error; | |
1442 | } | |
1443 | ||
1444 | /* Open debugfs lttng */ | |
1445 | kernel_tracer_fd = open(lttng_path, O_RDWR); | |
f3ed775e | 1446 | if (kernel_tracer_fd < 0) { |
b73401da DG |
1447 | DBG("Failed to open %s", lttng_path); |
1448 | goto error; | |
8c0faa1d DG |
1449 | } |
1450 | ||
b73401da DG |
1451 | free(lttng_path); |
1452 | free(debugfs_path); | |
f3ed775e | 1453 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
b73401da DG |
1454 | return; |
1455 | ||
1456 | error: | |
1457 | if (lttng_path) { | |
1458 | free(lttng_path); | |
1459 | } | |
1460 | if (debugfs_path) { | |
1461 | free(debugfs_path); | |
1462 | } | |
1463 | WARN("No kernel tracer available"); | |
1464 | kernel_tracer_fd = 0; | |
1465 | return; | |
f3ed775e | 1466 | } |
33a2b854 | 1467 | |
f3ed775e | 1468 | /* |
d063d709 DG |
1469 | * Start tracing by creating trace directory and sending FDs to the kernel |
1470 | * consumer. | |
f3ed775e DG |
1471 | */ |
1472 | static int start_kernel_trace(struct ltt_kernel_session *session) | |
1473 | { | |
f40799e8 | 1474 | int ret = 0; |
8c0faa1d | 1475 | |
f3ed775e | 1476 | if (session->kconsumer_fds_sent == 0) { |
d9800920 DG |
1477 | /* |
1478 | * Assign default kernel consumer if no consumer assigned to the kernel | |
1479 | * session. At this point, it's NOT suppose to be 0 but this is an extra | |
1480 | * security check. | |
1481 | */ | |
1482 | if (session->consumer_fd == 0) { | |
1483 | session->consumer_fd = kconsumerd_cmd_sock; | |
1484 | } | |
1485 | ||
1486 | ret = send_kconsumerd_fds(session); | |
f3ed775e DG |
1487 | if (ret < 0) { |
1488 | ERR("Send kconsumerd fds failed"); | |
1489 | ret = LTTCOMM_KERN_CONSUMER_FAIL; | |
1490 | goto error; | |
1491 | } | |
1d4b027a | 1492 | |
f3ed775e DG |
1493 | session->kconsumer_fds_sent = 1; |
1494 | } | |
1d4b027a DG |
1495 | |
1496 | error: | |
1497 | return ret; | |
8c0faa1d DG |
1498 | } |
1499 | ||
7a485870 DG |
1500 | /* |
1501 | * Notify kernel thread to update it's pollfd. | |
1502 | */ | |
1503 | static int notify_kernel_pollfd(void) | |
1504 | { | |
1505 | int ret; | |
1506 | ||
1507 | /* Inform kernel thread of the new kernel channel */ | |
1508 | ret = write(kernel_poll_pipe[1], "!", 1); | |
1509 | if (ret < 0) { | |
1510 | perror("write kernel poll pipe"); | |
1511 | } | |
1512 | ||
1513 | return ret; | |
1514 | } | |
1515 | ||
8c0faa1d | 1516 | /* |
d063d709 | 1517 | * Allocate a channel structure and fill it. |
8c0faa1d | 1518 | */ |
b389abbe MD |
1519 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
1520 | char *name) | |
8c0faa1d | 1521 | { |
f3ed775e | 1522 | struct lttng_channel *chan; |
1d4b027a | 1523 | |
f3ed775e DG |
1524 | chan = malloc(sizeof(struct lttng_channel)); |
1525 | if (chan == NULL) { | |
1526 | perror("init channel malloc"); | |
1527 | goto error; | |
8c0faa1d | 1528 | } |
1d4b027a | 1529 | |
ed8f384d | 1530 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
9f19cc17 | 1531 | perror("snprintf channel name"); |
b389abbe | 1532 | goto error; |
f3ed775e DG |
1533 | } |
1534 | ||
1535 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; | |
f3ed775e DG |
1536 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
1537 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; | |
1d4b027a | 1538 | |
b389abbe MD |
1539 | switch (domain_type) { |
1540 | case LTTNG_DOMAIN_KERNEL: | |
1541 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; | |
1542 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; | |
1543 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; | |
1544 | break; | |
1545 | /* TODO: add UST */ | |
1546 | default: | |
1547 | goto error; /* Not implemented */ | |
1548 | } | |
1549 | ||
f3ed775e | 1550 | return chan; |
b389abbe MD |
1551 | |
1552 | error: | |
1553 | free(chan); | |
1554 | return NULL; | |
8c0faa1d DG |
1555 | } |
1556 | ||
333f285e | 1557 | /* |
d063d709 | 1558 | * Create a kernel tracer session then create the default channel. |
333f285e | 1559 | */ |
f3ed775e | 1560 | static int create_kernel_session(struct ltt_session *session) |
333f285e | 1561 | { |
f3ed775e | 1562 | int ret; |
f3ed775e DG |
1563 | |
1564 | DBG("Creating kernel session"); | |
1565 | ||
1566 | ret = kernel_create_session(session, kernel_tracer_fd); | |
1567 | if (ret < 0) { | |
1568 | ret = LTTCOMM_KERN_SESS_FAIL; | |
1569 | goto error; | |
333f285e DG |
1570 | } |
1571 | ||
d9800920 DG |
1572 | /* Set kernel consumer socket fd */ |
1573 | if (kconsumerd_cmd_sock) { | |
1574 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; | |
1575 | } | |
1576 | ||
63053e7c DG |
1577 | ret = mkdir_recursive(session->kernel_session->trace_path, |
1578 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); | |
7a485870 | 1579 | if (ret < 0) { |
996b65c8 | 1580 | if (ret != -EEXIST) { |
7a485870 DG |
1581 | ERR("Trace directory creation error"); |
1582 | goto error; | |
1583 | } | |
1584 | } | |
1585 | ||
f3ed775e DG |
1586 | error: |
1587 | return ret; | |
333f285e DG |
1588 | } |
1589 | ||
6c9cc2ab DG |
1590 | /* |
1591 | * Using the session list, filled a lttng_session array to send back to the | |
1592 | * client for session listing. | |
1593 | * | |
1594 | * The session list lock MUST be acquired before calling this function. Use | |
1595 | * lock_session_list() and unlock_session_list(). | |
1596 | */ | |
1597 | static void list_lttng_sessions(struct lttng_session *sessions) | |
1598 | { | |
1599 | int i = 0; | |
1600 | struct ltt_session *session; | |
1601 | ||
1602 | DBG("Getting all available session"); | |
1603 | /* | |
1604 | * Iterate over session list and append data after the control struct in | |
1605 | * the buffer. | |
1606 | */ | |
1607 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { | |
1608 | strncpy(sessions[i].path, session->path, PATH_MAX); | |
99497cd0 | 1609 | sessions[i].path[PATH_MAX - 1] = '\0'; |
6c9cc2ab | 1610 | strncpy(sessions[i].name, session->name, NAME_MAX); |
99497cd0 | 1611 | sessions[i].name[NAME_MAX - 1] = '\0'; |
6c9cc2ab DG |
1612 | i++; |
1613 | } | |
1614 | } | |
1615 | ||
9f19cc17 DG |
1616 | /* |
1617 | * Fill lttng_channel array of all channels. | |
1618 | */ | |
1619 | static void list_lttng_channels(struct ltt_session *session, | |
1620 | struct lttng_channel *channels) | |
1621 | { | |
1622 | int i = 0; | |
1623 | struct ltt_kernel_channel *kchan; | |
1624 | ||
1625 | DBG("Listing channels for session %s", session->name); | |
1626 | ||
1627 | /* Kernel channels */ | |
1628 | if (session->kernel_session != NULL) { | |
1629 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { | |
1630 | /* Copy lttng_channel struct to array */ | |
1631 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); | |
1632 | channels[i].enabled = kchan->enabled; | |
1633 | i++; | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | /* TODO: Missing UST listing */ | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Fill lttng_event array of all events in the channel. | |
1642 | */ | |
1643 | static void list_lttng_events(struct ltt_kernel_channel *kchan, | |
1644 | struct lttng_event *events) | |
1645 | { | |
1646 | /* | |
1647 | * TODO: This is ONLY kernel. Need UST support. | |
1648 | */ | |
1649 | int i = 0; | |
1650 | struct ltt_kernel_event *event; | |
1651 | ||
1652 | DBG("Listing events for channel %s", kchan->channel->name); | |
1653 | ||
1654 | /* Kernel channels */ | |
1655 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { | |
1656 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1657 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
9f19cc17 DG |
1658 | events[i].enabled = event->enabled; |
1659 | switch (event->event->instrumentation) { | |
1660 | case LTTNG_KERNEL_TRACEPOINT: | |
1661 | events[i].type = LTTNG_EVENT_TRACEPOINT; | |
1662 | break; | |
1663 | case LTTNG_KERNEL_KPROBE: | |
1664 | case LTTNG_KERNEL_KRETPROBE: | |
1665 | events[i].type = LTTNG_EVENT_PROBE; | |
1666 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, | |
1667 | sizeof(struct lttng_kernel_kprobe)); | |
1668 | break; | |
1669 | case LTTNG_KERNEL_FUNCTION: | |
1670 | events[i].type = LTTNG_EVENT_FUNCTION; | |
1671 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, | |
1672 | sizeof(struct lttng_kernel_function)); | |
1673 | break; | |
1674 | } | |
1675 | i++; | |
1676 | } | |
1677 | } | |
1678 | ||
fac6795d | 1679 | /* |
d063d709 DG |
1680 | * Process the command requested by the lttng client within the command |
1681 | * context structure. This function make sure that the return structure (llm) | |
1682 | * is set and ready for transmission before returning. | |
fac6795d | 1683 | * |
e065084a | 1684 | * Return any error encountered or 0 for success. |
fac6795d | 1685 | */ |
5461b305 | 1686 | static int process_client_msg(struct command_ctx *cmd_ctx) |
fac6795d | 1687 | { |
f40799e8 | 1688 | int ret = LTTCOMM_OK; |
fac6795d | 1689 | |
5461b305 | 1690 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
fac6795d | 1691 | |
63053e7c DG |
1692 | /* |
1693 | * Commands that DO NOT need a session. | |
1694 | */ | |
5461b305 | 1695 | switch (cmd_ctx->lsm->cmd_type) { |
5e16da05 MD |
1696 | case LTTNG_CREATE_SESSION: |
1697 | case LTTNG_LIST_SESSIONS: | |
052da939 | 1698 | case LTTNG_LIST_TRACEPOINTS: |
d0254c7c | 1699 | case LTTNG_CALIBRATE: |
5e16da05 MD |
1700 | break; |
1701 | default: | |
42abccdb DG |
1702 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
1703 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); | |
5461b305 | 1704 | if (cmd_ctx->session == NULL) { |
f3ed775e | 1705 | /* If session name not found */ |
42abccdb | 1706 | if (cmd_ctx->lsm->session.name != NULL) { |
f3ed775e DG |
1707 | ret = LTTCOMM_SESS_NOT_FOUND; |
1708 | } else { /* If no session name specified */ | |
1709 | ret = LTTCOMM_SELECT_SESS; | |
1710 | } | |
5461b305 | 1711 | goto error; |
b5541356 DG |
1712 | } else { |
1713 | /* Acquire lock for the session */ | |
1714 | lock_session(cmd_ctx->session); | |
379473d2 | 1715 | } |
5e16da05 | 1716 | break; |
379473d2 DG |
1717 | } |
1718 | ||
f3ed775e | 1719 | /* |
d0254c7c | 1720 | * Check domain type for specific "pre-action". |
f3ed775e | 1721 | */ |
0d0c377a DG |
1722 | switch (cmd_ctx->lsm->domain.type) { |
1723 | case LTTNG_DOMAIN_KERNEL: | |
333f285e | 1724 | /* Kernel tracer check */ |
20fe2104 | 1725 | if (kernel_tracer_fd == 0) { |
333f285e DG |
1726 | init_kernel_tracer(); |
1727 | if (kernel_tracer_fd == 0) { | |
1728 | ret = LTTCOMM_KERN_NA; | |
1729 | goto error; | |
1730 | } | |
20fe2104 | 1731 | } |
f3ed775e DG |
1732 | |
1733 | /* Need a session for kernel command */ | |
d0254c7c | 1734 | switch (cmd_ctx->lsm->cmd_type) { |
d9800920 | 1735 | case LTTNG_CALIBRATE: |
d0254c7c MD |
1736 | case LTTNG_CREATE_SESSION: |
1737 | case LTTNG_LIST_SESSIONS: | |
1738 | case LTTNG_LIST_TRACEPOINTS: | |
d0254c7c MD |
1739 | break; |
1740 | default: | |
1741 | if (cmd_ctx->session->kernel_session == NULL) { | |
1742 | ret = create_kernel_session(cmd_ctx->session); | |
f3ed775e | 1743 | if (ret < 0) { |
d0254c7c | 1744 | ret = LTTCOMM_KERN_SESS_FAIL; |
f3ed775e DG |
1745 | goto error; |
1746 | } | |
d0254c7c MD |
1747 | |
1748 | /* Start the kernel consumer daemon */ | |
d9800920 DG |
1749 | |
1750 | if (kconsumerd_pid == 0 && | |
1751 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { | |
d0254c7c MD |
1752 | ret = start_kconsumerd(); |
1753 | if (ret < 0) { | |
1754 | goto error; | |
1755 | } | |
1756 | } | |
f3ed775e DG |
1757 | } |
1758 | } | |
0d0c377a DG |
1759 | break; |
1760 | default: | |
1761 | break; | |
20fe2104 DG |
1762 | } |
1763 | ||
fac6795d | 1764 | /* Process by command type */ |
5461b305 | 1765 | switch (cmd_ctx->lsm->cmd_type) { |
b579acd9 | 1766 | case LTTNG_ADD_CONTEXT: |
d65106b1 | 1767 | { |
b579acd9 | 1768 | struct lttng_kernel_context kctx; |
d65106b1 DG |
1769 | |
1770 | /* Setup lttng message with no payload */ | |
1771 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1772 | if (ret < 0) { | |
1773 | goto setup_error; | |
1774 | } | |
1775 | ||
b579acd9 DG |
1776 | switch (cmd_ctx->lsm->domain.type) { |
1777 | case LTTNG_DOMAIN_KERNEL: | |
1778 | /* Create Kernel context */ | |
1779 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; | |
1780 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; | |
1781 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; | |
1782 | strncpy(kctx.u.perf_counter.name, | |
1783 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, | |
1784 | LTTNG_SYMBOL_NAME_LEN); | |
99497cd0 | 1785 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
b579acd9 DG |
1786 | |
1787 | /* Add kernel context to kernel tracer. See context.c */ | |
1788 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, | |
1789 | cmd_ctx->lsm->u.context.event_name, | |
1790 | cmd_ctx->lsm->u.context.channel_name); | |
1791 | if (ret != LTTCOMM_OK) { | |
d65106b1 DG |
1792 | goto error; |
1793 | } | |
b579acd9 DG |
1794 | break; |
1795 | default: | |
1796 | /* TODO: Userspace tracing */ | |
1797 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
0b97ec54 | 1798 | goto error; |
d65106b1 DG |
1799 | } |
1800 | ||
1801 | ret = LTTCOMM_OK; | |
1802 | break; | |
1803 | } | |
0b97ec54 | 1804 | case LTTNG_DISABLE_CHANNEL: |
26cc6b4e | 1805 | { |
0b97ec54 | 1806 | struct ltt_kernel_channel *kchan; |
26cc6b4e DG |
1807 | |
1808 | /* Setup lttng message with no payload */ | |
1809 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1810 | if (ret < 0) { | |
1811 | goto setup_error; | |
1812 | } | |
1813 | ||
0b97ec54 DG |
1814 | switch (cmd_ctx->lsm->domain.type) { |
1815 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1816 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
0b97ec54 DG |
1817 | cmd_ctx->session->kernel_session); |
1818 | if (kchan == NULL) { | |
1819 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
26cc6b4e | 1820 | goto error; |
0b97ec54 DG |
1821 | } else if (kchan->enabled == 1) { |
1822 | ret = kernel_disable_channel(kchan); | |
1823 | if (ret < 0) { | |
1824 | if (ret != EEXIST) { | |
1825 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; | |
1826 | } | |
1827 | goto error; | |
1828 | } | |
26cc6b4e | 1829 | } |
0b97ec54 DG |
1830 | kernel_wait_quiescent(kernel_tracer_fd); |
1831 | break; | |
1832 | default: | |
1833 | /* TODO: Userspace tracing */ | |
1834 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1835 | goto error; | |
26cc6b4e DG |
1836 | } |
1837 | ||
26cc6b4e DG |
1838 | ret = LTTCOMM_OK; |
1839 | break; | |
1840 | } | |
f5177a38 | 1841 | case LTTNG_DISABLE_EVENT: |
e953ef25 | 1842 | { |
f5177a38 DG |
1843 | struct ltt_kernel_channel *kchan; |
1844 | struct ltt_kernel_event *kevent; | |
e953ef25 DG |
1845 | |
1846 | /* Setup lttng message with no payload */ | |
1847 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1848 | if (ret < 0) { | |
1849 | goto setup_error; | |
1850 | } | |
1851 | ||
f5177a38 DG |
1852 | switch (cmd_ctx->lsm->domain.type) { |
1853 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1854 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1855 | cmd_ctx->session->kernel_session); |
1856 | if (kchan == NULL) { | |
1857 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
19e70852 | 1858 | goto error; |
e953ef25 | 1859 | } |
f5177a38 | 1860 | |
62499ad6 | 1861 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
f5177a38 DG |
1862 | if (kevent != NULL) { |
1863 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, | |
1864 | kchan->channel->name); | |
1865 | ret = kernel_disable_event(kevent); | |
1866 | if (ret < 0) { | |
1867 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
1868 | goto error; | |
1869 | } | |
1870 | } | |
1871 | ||
1872 | kernel_wait_quiescent(kernel_tracer_fd); | |
1873 | break; | |
1874 | default: | |
1875 | /* TODO: Userspace tracing */ | |
1876 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1877 | goto error; | |
e953ef25 DG |
1878 | } |
1879 | ||
19e70852 | 1880 | ret = LTTCOMM_OK; |
e953ef25 DG |
1881 | break; |
1882 | } | |
f5177a38 | 1883 | case LTTNG_DISABLE_ALL_EVENT: |
950131af | 1884 | { |
f5177a38 DG |
1885 | struct ltt_kernel_channel *kchan; |
1886 | struct ltt_kernel_event *kevent; | |
950131af DG |
1887 | |
1888 | /* Setup lttng message with no payload */ | |
1889 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1890 | if (ret < 0) { | |
1891 | goto setup_error; | |
1892 | } | |
1893 | ||
f5177a38 DG |
1894 | switch (cmd_ctx->lsm->domain.type) { |
1895 | case LTTNG_DOMAIN_KERNEL: | |
1896 | DBG("Disabling all enabled kernel events"); | |
62499ad6 | 1897 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
f5177a38 DG |
1898 | cmd_ctx->session->kernel_session); |
1899 | if (kchan == NULL) { | |
1900 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
1901 | goto error; | |
1902 | } | |
950131af | 1903 | |
f5177a38 DG |
1904 | /* For each event in the kernel session */ |
1905 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
1906 | DBG("Disabling kernel event %s for channel %s.", | |
1907 | kevent->event->name, kchan->channel->name); | |
1908 | ret = kernel_disable_event(kevent); | |
1909 | if (ret < 0) { | |
1910 | continue; | |
1911 | } | |
950131af | 1912 | } |
f5177a38 DG |
1913 | |
1914 | /* Quiescent wait after event disable */ | |
1915 | kernel_wait_quiescent(kernel_tracer_fd); | |
1916 | break; | |
1917 | default: | |
1918 | /* TODO: Userspace tracing */ | |
1919 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1920 | goto error; | |
950131af DG |
1921 | } |
1922 | ||
950131af DG |
1923 | ret = LTTCOMM_OK; |
1924 | break; | |
1925 | } | |
0d0c377a | 1926 | case LTTNG_ENABLE_CHANNEL: |
d36b8583 | 1927 | { |
0d0c377a | 1928 | struct ltt_kernel_channel *kchan; |
d36b8583 DG |
1929 | |
1930 | /* Setup lttng message with no payload */ | |
1931 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1932 | if (ret < 0) { | |
1933 | goto setup_error; | |
1934 | } | |
1935 | ||
0d0c377a DG |
1936 | switch (cmd_ctx->lsm->domain.type) { |
1937 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1938 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
0d0c377a DG |
1939 | cmd_ctx->session->kernel_session); |
1940 | if (kchan == NULL) { | |
1941 | /* Channel not found, creating it */ | |
1942 | DBG("Creating kernel channel"); | |
7d29a247 | 1943 | |
0d0c377a | 1944 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
63053e7c DG |
1945 | &cmd_ctx->lsm->u.channel.chan, |
1946 | cmd_ctx->session->kernel_session->trace_path); | |
0d0c377a DG |
1947 | if (ret < 0) { |
1948 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
1949 | goto error; | |
1950 | } | |
7d29a247 | 1951 | |
0d0c377a DG |
1952 | /* Notify kernel thread that there is a new channel */ |
1953 | ret = notify_kernel_pollfd(); | |
1954 | if (ret < 0) { | |
1955 | ret = LTTCOMM_FATAL; | |
1956 | goto error; | |
1957 | } | |
1958 | } else if (kchan->enabled == 0) { | |
1959 | ret = kernel_enable_channel(kchan); | |
1960 | if (ret < 0) { | |
1961 | if (ret != EEXIST) { | |
1962 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; | |
1963 | } | |
1964 | goto error; | |
d36b8583 | 1965 | } |
d36b8583 | 1966 | } |
0d0c377a DG |
1967 | |
1968 | kernel_wait_quiescent(kernel_tracer_fd); | |
1969 | break; | |
1970 | default: | |
1971 | /* TODO: Userspace tracing */ | |
1972 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
1973 | goto error; | |
d36b8583 DG |
1974 | } |
1975 | ||
d36b8583 DG |
1976 | ret = LTTCOMM_OK; |
1977 | break; | |
1978 | } | |
0d0c377a | 1979 | case LTTNG_ENABLE_EVENT: |
894be886 | 1980 | { |
7d29a247 DG |
1981 | char *channel_name; |
1982 | struct ltt_kernel_channel *kchan; | |
0d0c377a | 1983 | struct ltt_kernel_event *kevent; |
7d29a247 | 1984 | struct lttng_channel *chan; |
f3ed775e | 1985 | |
894be886 DG |
1986 | /* Setup lttng message with no payload */ |
1987 | ret = setup_lttng_msg(cmd_ctx, 0); | |
1988 | if (ret < 0) { | |
1989 | goto setup_error; | |
1990 | } | |
1991 | ||
7d29a247 DG |
1992 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
1993 | ||
0d0c377a DG |
1994 | switch (cmd_ctx->lsm->domain.type) { |
1995 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 1996 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
1997 | cmd_ctx->session->kernel_session); |
1998 | if (kchan == NULL) { | |
1999 | DBG("Channel not found. Creating channel %s", channel_name); | |
2000 | ||
2001 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2002 | if (chan == NULL) { | |
2003 | ret = LTTCOMM_FATAL; | |
2004 | goto error; | |
2005 | } | |
2006 | ||
2007 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2008 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2009 | if (ret < 0) { | |
2010 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2011 | goto error; | |
2012 | } | |
62499ad6 | 2013 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2014 | cmd_ctx->session->kernel_session); |
2015 | if (kchan == NULL) { | |
b389abbe MD |
2016 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2017 | channel_name); | |
2018 | ret = LTTCOMM_FATAL; | |
2019 | goto error; | |
7d29a247 | 2020 | } |
b389abbe | 2021 | } |
7d29a247 | 2022 | |
62499ad6 | 2023 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
0d0c377a DG |
2024 | if (kevent == NULL) { |
2025 | DBG("Creating kernel event %s for channel %s.", | |
2026 | cmd_ctx->lsm->u.enable.event.name, channel_name); | |
2027 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); | |
2028 | } else { | |
2029 | DBG("Enabling kernel event %s for channel %s.", | |
2030 | kevent->event->name, channel_name); | |
2031 | ret = kernel_enable_event(kevent); | |
2032 | if (ret == -EEXIST) { | |
2033 | ret = LTTCOMM_KERN_EVENT_EXIST; | |
7d29a247 DG |
2034 | goto error; |
2035 | } | |
2036 | } | |
f34daff7 | 2037 | |
0d0c377a DG |
2038 | if (ret < 0) { |
2039 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
7d29a247 DG |
2040 | goto error; |
2041 | } | |
19e70852 | 2042 | |
0d0c377a DG |
2043 | kernel_wait_quiescent(kernel_tracer_fd); |
2044 | break; | |
2045 | default: | |
2046 | /* TODO: Userspace tracing */ | |
2047 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
19e70852 | 2048 | goto error; |
f3ed775e | 2049 | } |
19e70852 | 2050 | ret = LTTCOMM_OK; |
894be886 DG |
2051 | break; |
2052 | } | |
0d0c377a | 2053 | case LTTNG_ENABLE_ALL_EVENT: |
33a2b854 | 2054 | { |
9f19cc17 DG |
2055 | int size, i; |
2056 | char *channel_name; | |
7d29a247 | 2057 | struct ltt_kernel_channel *kchan; |
0d0c377a | 2058 | struct ltt_kernel_event *kevent; |
9f19cc17 | 2059 | struct lttng_event *event_list; |
7d29a247 | 2060 | struct lttng_channel *chan; |
33a2b854 DG |
2061 | |
2062 | /* Setup lttng message with no payload */ | |
2063 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2064 | if (ret < 0) { | |
2065 | goto setup_error; | |
2066 | } | |
2067 | ||
2068 | DBG("Enabling all kernel event"); | |
2069 | ||
7d29a247 DG |
2070 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
2071 | ||
0d0c377a DG |
2072 | switch (cmd_ctx->lsm->domain.type) { |
2073 | case LTTNG_DOMAIN_KERNEL: | |
62499ad6 | 2074 | kchan = trace_kernel_get_channel_by_name(channel_name, |
b389abbe MD |
2075 | cmd_ctx->session->kernel_session); |
2076 | if (kchan == NULL) { | |
2077 | DBG("Channel not found. Creating channel %s", channel_name); | |
2078 | ||
2079 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); | |
2080 | if (chan == NULL) { | |
2081 | ret = LTTCOMM_FATAL; | |
2082 | goto error; | |
2083 | } | |
2084 | ||
2085 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, | |
2086 | chan, cmd_ctx->session->kernel_session->trace_path); | |
2087 | if (ret < 0) { | |
2088 | ret = LTTCOMM_KERN_CHAN_FAIL; | |
2089 | goto error; | |
2090 | } | |
62499ad6 | 2091 | kchan = trace_kernel_get_channel_by_name(channel_name, |
0d0c377a DG |
2092 | cmd_ctx->session->kernel_session); |
2093 | if (kchan == NULL) { | |
b389abbe MD |
2094 | ERR("Channel %s not found after creation. Internal error, giving up.", |
2095 | channel_name); | |
2096 | ret = LTTCOMM_FATAL; | |
2097 | goto error; | |
7d29a247 | 2098 | } |
b389abbe | 2099 | } |
7d29a247 | 2100 | |
0d0c377a DG |
2101 | /* For each event in the kernel session */ |
2102 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { | |
2103 | DBG("Enabling kernel event %s for channel %s.", | |
2104 | kevent->event->name, channel_name); | |
2105 | ret = kernel_enable_event(kevent); | |
7d29a247 | 2106 | if (ret < 0) { |
0d0c377a | 2107 | continue; |
7d29a247 DG |
2108 | } |
2109 | } | |
33a2b854 | 2110 | |
0d0c377a DG |
2111 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
2112 | if (size < 0) { | |
2113 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2114 | goto error; | |
f3ed775e | 2115 | } |
f3ed775e | 2116 | |
0d0c377a | 2117 | for (i = 0; i < size; i++) { |
62499ad6 | 2118 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
0d0c377a DG |
2119 | if (kevent == NULL) { |
2120 | /* Default event type for enable all */ | |
2121 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; | |
2122 | /* Enable each single tracepoint event */ | |
2123 | ret = kernel_create_event(&event_list[i], kchan); | |
2124 | if (ret < 0) { | |
2125 | /* Ignore error here and continue */ | |
2126 | } | |
950131af | 2127 | } |
33a2b854 | 2128 | } |
33a2b854 | 2129 | |
0d0c377a DG |
2130 | free(event_list); |
2131 | ||
2132 | /* Quiescent wait after event enable */ | |
2133 | kernel_wait_quiescent(kernel_tracer_fd); | |
2134 | break; | |
2135 | default: | |
2136 | /* TODO: Userspace tracing */ | |
2137 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2138 | goto error; | |
2139 | } | |
33a2b854 DG |
2140 | |
2141 | ret = LTTCOMM_OK; | |
2142 | break; | |
2143 | } | |
052da939 | 2144 | case LTTNG_LIST_TRACEPOINTS: |
2ef84c95 | 2145 | { |
9f19cc17 | 2146 | struct lttng_event *events; |
052da939 DG |
2147 | ssize_t nb_events = 0; |
2148 | ||
2149 | switch (cmd_ctx->lsm->domain.type) { | |
2150 | case LTTNG_DOMAIN_KERNEL: | |
2151 | DBG("Listing kernel events"); | |
2152 | nb_events = kernel_list_events(kernel_tracer_fd, &events); | |
2153 | if (nb_events < 0) { | |
2154 | ret = LTTCOMM_KERN_LIST_FAIL; | |
2155 | goto error; | |
2156 | } | |
2157 | break; | |
2158 | default: | |
2159 | /* TODO: Userspace listing */ | |
2160 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2161 | break; | |
2ef84c95 DG |
2162 | } |
2163 | ||
2164 | /* | |
2165 | * Setup lttng message with payload size set to the event list size in | |
2166 | * bytes and then copy list into the llm payload. | |
2167 | */ | |
052da939 | 2168 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2169 | if (ret < 0) { |
052da939 | 2170 | free(events); |
2ef84c95 DG |
2171 | goto setup_error; |
2172 | } | |
2173 | ||
2174 | /* Copy event list into message payload */ | |
9f19cc17 | 2175 | memcpy(cmd_ctx->llm->payload, events, |
052da939 | 2176 | sizeof(struct lttng_event) * nb_events); |
2ef84c95 | 2177 | |
9f19cc17 | 2178 | free(events); |
2ef84c95 DG |
2179 | |
2180 | ret = LTTCOMM_OK; | |
2181 | break; | |
2182 | } | |
f3ed775e | 2183 | case LTTNG_START_TRACE: |
8c0faa1d DG |
2184 | { |
2185 | struct ltt_kernel_channel *chan; | |
f3ed775e | 2186 | |
8c0faa1d DG |
2187 | /* Setup lttng message with no payload */ |
2188 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2189 | if (ret < 0) { | |
2190 | goto setup_error; | |
2191 | } | |
2192 | ||
f3ed775e DG |
2193 | /* Kernel tracing */ |
2194 | if (cmd_ctx->session->kernel_session != NULL) { | |
2195 | if (cmd_ctx->session->kernel_session->metadata == NULL) { | |
2196 | DBG("Open kernel metadata"); | |
58a97671 | 2197 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
63053e7c | 2198 | cmd_ctx->session->kernel_session->trace_path); |
f3ed775e DG |
2199 | if (ret < 0) { |
2200 | ret = LTTCOMM_KERN_META_FAIL; | |
2201 | goto error; | |
2202 | } | |
2203 | } | |
8c0faa1d | 2204 | |
f3ed775e DG |
2205 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
2206 | DBG("Opening kernel metadata stream"); | |
2207 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { | |
2208 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); | |
2209 | if (ret < 0) { | |
2210 | ERR("Kernel create metadata stream failed"); | |
2211 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2212 | goto error; | |
2213 | } | |
2214 | } | |
2215 | } | |
8c0faa1d | 2216 | |
f3ed775e | 2217 | /* For each channel */ |
0d0c377a DG |
2218 | cds_list_for_each_entry(chan, |
2219 | &cmd_ctx->session->kernel_session->channel_list.head, list) { | |
f3ed775e DG |
2220 | if (chan->stream_count == 0) { |
2221 | ret = kernel_open_channel_stream(chan); | |
2222 | if (ret < 0) { | |
2223 | ERR("Kernel create channel stream failed"); | |
2224 | ret = LTTCOMM_KERN_STREAM_FAIL; | |
2225 | goto error; | |
2226 | } | |
2227 | /* Update the stream global counter */ | |
2228 | cmd_ctx->session->kernel_session->stream_count_global += ret; | |
2229 | } | |
2230 | } | |
2231 | ||
283046e0 | 2232 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
8c0faa1d | 2233 | if (ret < 0) { |
f3ed775e | 2234 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2235 | goto error; |
2236 | } | |
8c0faa1d | 2237 | |
283046e0 DG |
2238 | DBG("Start kernel tracing"); |
2239 | ret = kernel_start_session(cmd_ctx->session->kernel_session); | |
f3ed775e | 2240 | if (ret < 0) { |
283046e0 | 2241 | ERR("Kernel start session failed"); |
f3ed775e | 2242 | ret = LTTCOMM_KERN_START_FAIL; |
8c0faa1d DG |
2243 | goto error; |
2244 | } | |
8c0faa1d | 2245 | |
f3ed775e DG |
2246 | /* Quiescent wait after starting trace */ |
2247 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2248 | } |
2249 | ||
f3ed775e | 2250 | /* TODO: Start all UST traces */ |
8c0faa1d DG |
2251 | |
2252 | ret = LTTCOMM_OK; | |
2253 | break; | |
2254 | } | |
f3ed775e | 2255 | case LTTNG_STOP_TRACE: |
8c0faa1d | 2256 | { |
f3ed775e | 2257 | struct ltt_kernel_channel *chan; |
8c0faa1d DG |
2258 | /* Setup lttng message with no payload */ |
2259 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2260 | if (ret < 0) { | |
2261 | goto setup_error; | |
2262 | } | |
2263 | ||
f3ed775e DG |
2264 | /* Kernel tracer */ |
2265 | if (cmd_ctx->session->kernel_session != NULL) { | |
2266 | DBG("Stop kernel tracing"); | |
84291629 | 2267 | |
f3ed775e DG |
2268 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
2269 | if (ret < 0) { | |
2270 | ERR("Kernel metadata flush failed"); | |
2271 | } | |
8c0faa1d | 2272 | |
f3ed775e DG |
2273 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
2274 | ret = kernel_flush_buffer(chan); | |
2275 | if (ret < 0) { | |
2276 | ERR("Kernel flush buffer error"); | |
2277 | } | |
2278 | } | |
2279 | ||
2280 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); | |
2281 | if (ret < 0) { | |
2282 | ERR("Kernel stop session failed"); | |
2283 | ret = LTTCOMM_KERN_STOP_FAIL; | |
2284 | goto error; | |
2285 | } | |
2286 | ||
2287 | /* Quiescent wait after stopping trace */ | |
2288 | kernel_wait_quiescent(kernel_tracer_fd); | |
8c0faa1d DG |
2289 | } |
2290 | ||
f3ed775e | 2291 | /* TODO : User-space tracer */ |
8c0faa1d DG |
2292 | |
2293 | ret = LTTCOMM_OK; | |
2294 | break; | |
2295 | } | |
5e16da05 MD |
2296 | case LTTNG_CREATE_SESSION: |
2297 | { | |
5461b305 DG |
2298 | /* Setup lttng message with no payload */ |
2299 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2300 | if (ret < 0) { | |
2301 | goto setup_error; | |
2302 | } | |
2303 | ||
42abccdb | 2304 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
5e16da05 | 2305 | if (ret < 0) { |
f3ed775e | 2306 | if (ret == -EEXIST) { |
5e16da05 MD |
2307 | ret = LTTCOMM_EXIST_SESS; |
2308 | } else { | |
aaf97519 | 2309 | ret = LTTCOMM_FATAL; |
aaf97519 | 2310 | } |
5461b305 | 2311 | goto error; |
8028d920 | 2312 | } |
1657e9bb | 2313 | |
5461b305 | 2314 | ret = LTTCOMM_OK; |
5e16da05 MD |
2315 | break; |
2316 | } | |
2317 | case LTTNG_DESTROY_SESSION: | |
2318 | { | |
5461b305 DG |
2319 | /* Setup lttng message with no payload */ |
2320 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2321 | if (ret < 0) { | |
2322 | goto setup_error; | |
2323 | } | |
2324 | ||
f3ed775e DG |
2325 | /* Clean kernel session teardown */ |
2326 | teardown_kernel_session(cmd_ctx->session); | |
2327 | ||
42abccdb | 2328 | ret = destroy_session(cmd_ctx->lsm->session.name); |
5e16da05 | 2329 | if (ret < 0) { |
f3ed775e | 2330 | ret = LTTCOMM_FATAL; |
5461b305 | 2331 | goto error; |
5e16da05 | 2332 | } |
1657e9bb | 2333 | |
7a485870 DG |
2334 | /* |
2335 | * Must notify the kernel thread here to update it's pollfd in order to | |
2336 | * remove the channel(s)' fd just destroyed. | |
2337 | */ | |
2338 | ret = notify_kernel_pollfd(); | |
2339 | if (ret < 0) { | |
2340 | ret = LTTCOMM_FATAL; | |
2341 | goto error; | |
2342 | } | |
2343 | ||
5461b305 DG |
2344 | ret = LTTCOMM_OK; |
2345 | break; | |
5e16da05 | 2346 | } |
9f19cc17 | 2347 | case LTTNG_LIST_DOMAINS: |
5e16da05 | 2348 | { |
4b222185 | 2349 | size_t nb_dom = 0; |
5461b305 | 2350 | |
9f19cc17 DG |
2351 | if (cmd_ctx->session->kernel_session != NULL) { |
2352 | nb_dom++; | |
ce3d728c | 2353 | } |
520ff687 | 2354 | |
9f19cc17 DG |
2355 | nb_dom += cmd_ctx->session->ust_trace_count; |
2356 | ||
2357 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); | |
5461b305 DG |
2358 | if (ret < 0) { |
2359 | goto setup_error; | |
520ff687 | 2360 | } |
57167058 | 2361 | |
9f19cc17 DG |
2362 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
2363 | LTTNG_DOMAIN_KERNEL; | |
5e16da05 | 2364 | |
9f19cc17 | 2365 | /* TODO: User-space tracer domain support */ |
5461b305 | 2366 | ret = LTTCOMM_OK; |
5e16da05 MD |
2367 | break; |
2368 | } | |
9f19cc17 | 2369 | case LTTNG_LIST_CHANNELS: |
5e16da05 | 2370 | { |
9f19cc17 DG |
2371 | /* |
2372 | * TODO: Only kernel channels are listed here. UST listing | |
2373 | * is needed on lttng-ust 2.0 release. | |
2374 | */ | |
2375 | size_t nb_chan = 0; | |
2376 | if (cmd_ctx->session->kernel_session != NULL) { | |
2377 | nb_chan += cmd_ctx->session->kernel_session->channel_count; | |
5461b305 | 2378 | } |
ca95a216 | 2379 | |
9f19cc17 DG |
2380 | ret = setup_lttng_msg(cmd_ctx, |
2381 | sizeof(struct lttng_channel) * nb_chan); | |
5461b305 DG |
2382 | if (ret < 0) { |
2383 | goto setup_error; | |
2384 | } | |
9f19cc17 DG |
2385 | |
2386 | list_lttng_channels(cmd_ctx->session, | |
2387 | (struct lttng_channel *)(cmd_ctx->llm->payload)); | |
2388 | ||
2389 | ret = LTTCOMM_OK; | |
5461b305 | 2390 | break; |
5e16da05 | 2391 | } |
9f19cc17 | 2392 | case LTTNG_LIST_EVENTS: |
5e16da05 | 2393 | { |
9f19cc17 DG |
2394 | /* |
2395 | * TODO: Only kernel events are listed here. UST listing | |
2396 | * is needed on lttng-ust 2.0 release. | |
2397 | */ | |
2398 | size_t nb_event = 0; | |
2399 | struct ltt_kernel_channel *kchan = NULL; | |
2400 | ||
2401 | if (cmd_ctx->session->kernel_session != NULL) { | |
62499ad6 | 2402 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
9f19cc17 DG |
2403 | cmd_ctx->session->kernel_session); |
2404 | if (kchan == NULL) { | |
2405 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; | |
2406 | goto error; | |
2407 | } | |
2408 | nb_event += kchan->event_count; | |
5461b305 | 2409 | } |
ca95a216 | 2410 | |
9f19cc17 DG |
2411 | ret = setup_lttng_msg(cmd_ctx, |
2412 | sizeof(struct lttng_event) * nb_event); | |
5461b305 DG |
2413 | if (ret < 0) { |
2414 | goto setup_error; | |
2415 | } | |
9f19cc17 | 2416 | |
ced2f820 | 2417 | DBG("Listing events (%zu events)", nb_event); |
9f19cc17 DG |
2418 | |
2419 | list_lttng_events(kchan, | |
2420 | (struct lttng_event *)(cmd_ctx->llm->payload)); | |
2421 | ||
2422 | ret = LTTCOMM_OK; | |
5461b305 | 2423 | break; |
5e16da05 MD |
2424 | } |
2425 | case LTTNG_LIST_SESSIONS: | |
2426 | { | |
6c9cc2ab | 2427 | lock_session_list(); |
5461b305 | 2428 | |
6c9cc2ab | 2429 | if (session_list_ptr->count == 0) { |
f3ed775e | 2430 | ret = LTTCOMM_NO_SESSION; |
36a83748 | 2431 | unlock_session_list(); |
5461b305 | 2432 | goto error; |
57167058 | 2433 | } |
5e16da05 | 2434 | |
6c9cc2ab DG |
2435 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
2436 | session_list_ptr->count); | |
5461b305 | 2437 | if (ret < 0) { |
36a83748 | 2438 | unlock_session_list(); |
5461b305 | 2439 | goto setup_error; |
e065084a | 2440 | } |
5e16da05 | 2441 | |
6c9cc2ab DG |
2442 | /* Filled the session array */ |
2443 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); | |
2444 | ||
2445 | unlock_session_list(); | |
5e16da05 | 2446 | |
5461b305 | 2447 | ret = LTTCOMM_OK; |
5e16da05 MD |
2448 | break; |
2449 | } | |
d0254c7c MD |
2450 | case LTTNG_CALIBRATE: |
2451 | { | |
2452 | /* Setup lttng message with no payload */ | |
2453 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2454 | if (ret < 0) { | |
2455 | goto setup_error; | |
2456 | } | |
2457 | ||
2458 | switch (cmd_ctx->lsm->domain.type) { | |
2459 | case LTTNG_DOMAIN_KERNEL: | |
2460 | { | |
2461 | struct lttng_kernel_calibrate kcalibrate; | |
2462 | ||
2463 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; | |
2464 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); | |
2465 | if (ret < 0) { | |
2466 | ret = LTTCOMM_KERN_ENABLE_FAIL; | |
2467 | goto error; | |
2468 | } | |
2469 | break; | |
2470 | } | |
2471 | default: | |
2472 | /* TODO: Userspace tracing */ | |
2473 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2474 | goto error; | |
2475 | } | |
2476 | ret = LTTCOMM_OK; | |
2477 | break; | |
2478 | } | |
d9800920 DG |
2479 | case LTTNG_REGISTER_CONSUMER: |
2480 | { | |
2481 | int sock; | |
2482 | ||
2483 | /* Setup lttng message with no payload */ | |
2484 | ret = setup_lttng_msg(cmd_ctx, 0); | |
2485 | if (ret < 0) { | |
2486 | goto setup_error; | |
2487 | } | |
2488 | ||
2489 | switch (cmd_ctx->lsm->domain.type) { | |
2490 | case LTTNG_DOMAIN_KERNEL: | |
2491 | { | |
2492 | /* Can't register a consumer if there is already one */ | |
2493 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { | |
2494 | ret = LTTCOMM_CONNECT_FAIL; | |
2495 | goto error; | |
2496 | } | |
2497 | ||
2498 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); | |
2499 | if (sock < 0) { | |
2500 | ret = LTTCOMM_CONNECT_FAIL; | |
2501 | goto error; | |
2502 | } | |
2503 | ||
2504 | cmd_ctx->session->kernel_session->consumer_fd = sock; | |
2505 | break; | |
2506 | } | |
2507 | default: | |
2508 | /* TODO: Userspace tracing */ | |
2509 | ret = LTTCOMM_NOT_IMPLEMENTED; | |
2510 | goto error; | |
2511 | } | |
2512 | ||
2513 | ret = LTTCOMM_OK; | |
2514 | break; | |
2515 | } | |
d0254c7c | 2516 | |
5e16da05 MD |
2517 | default: |
2518 | /* Undefined command */ | |
5461b305 DG |
2519 | ret = setup_lttng_msg(cmd_ctx, 0); |
2520 | if (ret < 0) { | |
2521 | goto setup_error; | |
2522 | } | |
2523 | ||
5e16da05 | 2524 | ret = LTTCOMM_UND; |
5461b305 | 2525 | break; |
fac6795d DG |
2526 | } |
2527 | ||
5461b305 DG |
2528 | /* Set return code */ |
2529 | cmd_ctx->llm->ret_code = ret; | |
ca95a216 | 2530 | |
b5541356 DG |
2531 | if (cmd_ctx->session) { |
2532 | unlock_session(cmd_ctx->session); | |
2533 | } | |
2534 | ||
e065084a DG |
2535 | return ret; |
2536 | ||
5461b305 | 2537 | error: |
5461b305 DG |
2538 | if (cmd_ctx->llm == NULL) { |
2539 | DBG("Missing llm structure. Allocating one."); | |
894be886 | 2540 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
5461b305 DG |
2541 | goto setup_error; |
2542 | } | |
2543 | } | |
e065084a | 2544 | /* Notify client of error */ |
5461b305 | 2545 | cmd_ctx->llm->ret_code = ret; |
e065084a | 2546 | |
5461b305 | 2547 | setup_error: |
b5541356 DG |
2548 | if (cmd_ctx->session) { |
2549 | unlock_session(cmd_ctx->session); | |
2550 | } | |
8028d920 | 2551 | return ret; |
fac6795d DG |
2552 | } |
2553 | ||
1d4b027a | 2554 | /* |
d063d709 DG |
2555 | * This thread manage all clients request using the unix client socket for |
2556 | * communication. | |
1d4b027a DG |
2557 | */ |
2558 | static void *thread_manage_clients(void *data) | |
2559 | { | |
273ea72c DG |
2560 | int sock = 0, ret; |
2561 | struct command_ctx *cmd_ctx = NULL; | |
2562 | struct pollfd pollfd[2]; | |
1d4b027a DG |
2563 | |
2564 | DBG("[thread] Manage client started"); | |
2565 | ||
2566 | ret = lttcomm_listen_unix_sock(client_sock); | |
2567 | if (ret < 0) { | |
2568 | goto error; | |
2569 | } | |
2570 | ||
273ea72c DG |
2571 | /* First fd is always the quit pipe */ |
2572 | pollfd[0].fd = thread_quit_pipe[0]; | |
2573 | ||
2574 | /* Apps socket */ | |
2575 | pollfd[1].fd = client_sock; | |
2576 | pollfd[1].events = POLLIN; | |
2577 | ||
1d4b027a DG |
2578 | /* Notify parent pid that we are ready |
2579 | * to accept command for client side. | |
2580 | */ | |
2581 | if (opt_sig_parent) { | |
2582 | kill(ppid, SIGCHLD); | |
2583 | } | |
2584 | ||
2585 | while (1) { | |
1d4b027a | 2586 | DBG("Accepting client command ..."); |
273ea72c DG |
2587 | |
2588 | /* Inifinite blocking call, waiting for transmission */ | |
2589 | ret = poll(pollfd, 2, -1); | |
2590 | if (ret < 0) { | |
2591 | perror("poll client thread"); | |
2592 | goto error; | |
2593 | } | |
2594 | ||
2595 | /* Thread quit pipe has been closed. Killing thread. */ | |
2596 | if (pollfd[0].revents == POLLNVAL) { | |
2597 | goto error; | |
2598 | } else if (pollfd[1].revents == POLLERR) { | |
2599 | ERR("Client socket poll error"); | |
2600 | goto error; | |
2601 | } | |
2602 | ||
1d4b027a DG |
2603 | sock = lttcomm_accept_unix_sock(client_sock); |
2604 | if (sock < 0) { | |
2605 | goto error; | |
2606 | } | |
2607 | ||
2608 | /* Allocate context command to process the client request */ | |
2609 | cmd_ctx = malloc(sizeof(struct command_ctx)); | |
2610 | ||
2611 | /* Allocate data buffer for reception */ | |
2612 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); | |
2613 | cmd_ctx->llm = NULL; | |
2614 | cmd_ctx->session = NULL; | |
2615 | ||
2616 | /* | |
2617 | * Data is received from the lttng client. The struct | |
2618 | * lttcomm_session_msg (lsm) contains the command and data request of | |
2619 | * the client. | |
2620 | */ | |
2621 | DBG("Receiving data from client ..."); | |
2622 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); | |
2623 | if (ret <= 0) { | |
2624 | continue; | |
2625 | } | |
2626 | ||
f7776ea7 DG |
2627 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
2628 | ||
1d4b027a DG |
2629 | /* |
2630 | * This function dispatch the work to the kernel or userspace tracer | |
2631 | * libs and fill the lttcomm_lttng_msg data structure of all the needed | |
2632 | * informations for the client. The command context struct contains | |
2633 | * everything this function may needs. | |
2634 | */ | |
2635 | ret = process_client_msg(cmd_ctx); | |
2636 | if (ret < 0) { | |
2637 | /* TODO: Inform client somehow of the fatal error. At this point, | |
2638 | * ret < 0 means that a malloc failed (ENOMEM). */ | |
2639 | /* Error detected but still accept command */ | |
a2fb29a5 | 2640 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2641 | continue; |
2642 | } | |
2643 | ||
2644 | DBG("Sending response (size: %d, retcode: %d)", | |
2645 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); | |
2646 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); | |
2647 | if (ret < 0) { | |
2648 | ERR("Failed to send data back to client"); | |
2649 | } | |
2650 | ||
a2fb29a5 | 2651 | clean_command_ctx(&cmd_ctx); |
d6e4fca4 DG |
2652 | |
2653 | /* End of transmission */ | |
2654 | close(sock); | |
1d4b027a DG |
2655 | } |
2656 | ||
2657 | error: | |
273ea72c DG |
2658 | DBG("Client thread dying"); |
2659 | if (client_sock) { | |
2660 | close(client_sock); | |
2661 | } | |
2662 | if (sock) { | |
2663 | close(sock); | |
2664 | } | |
2665 | ||
2666 | unlink(client_unix_sock_path); | |
2667 | ||
a2fb29a5 | 2668 | clean_command_ctx(&cmd_ctx); |
1d4b027a DG |
2669 | return NULL; |
2670 | } | |
2671 | ||
2672 | ||
fac6795d DG |
2673 | /* |
2674 | * usage function on stderr | |
2675 | */ | |
2676 | static void usage(void) | |
2677 | { | |
b716ce68 | 2678 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
d6f42150 DG |
2679 | fprintf(stderr, " -h, --help Display this usage.\n"); |
2680 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); | |
2681 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); | |
2682 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); | |
2683 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); | |
2684 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); | |
2685 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); | |
2686 | fprintf(stderr, " -V, --version Show version number.\n"); | |
2687 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); | |
2688 | fprintf(stderr, " -q, --quiet No output at all.\n"); | |
2689 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); | |
31f73cc9 | 2690 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
fac6795d DG |
2691 | } |
2692 | ||
2693 | /* | |
2694 | * daemon argument parsing | |
2695 | */ | |
2696 | static int parse_args(int argc, char **argv) | |
2697 | { | |
2698 | int c; | |
2699 | ||
2700 | static struct option long_options[] = { | |
2701 | { "client-sock", 1, 0, 'c' }, | |
2702 | { "apps-sock", 1, 0, 'a' }, | |
d6f42150 DG |
2703 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
2704 | { "kconsumerd-err-sock", 1, 0, 0 }, | |
fac6795d | 2705 | { "daemonize", 0, 0, 'd' }, |
5b8719f5 | 2706 | { "sig-parent", 0, 0, 'S' }, |
fac6795d DG |
2707 | { "help", 0, 0, 'h' }, |
2708 | { "group", 1, 0, 'g' }, | |
2709 | { "version", 0, 0, 'V' }, | |
75462a81 | 2710 | { "quiet", 0, 0, 'q' }, |
3f9947db | 2711 | { "verbose", 0, 0, 'v' }, |
31f73cc9 | 2712 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
fac6795d DG |
2713 | { NULL, 0, 0, 0 } |
2714 | }; | |
2715 | ||
2716 | while (1) { | |
2717 | int option_index = 0; | |
31f73cc9 | 2718 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
fac6795d DG |
2719 | if (c == -1) { |
2720 | break; | |
2721 | } | |
2722 | ||
2723 | switch (c) { | |
2724 | case 0: | |
2725 | fprintf(stderr, "option %s", long_options[option_index].name); | |
2726 | if (optarg) { | |
2727 | fprintf(stderr, " with arg %s\n", optarg); | |
2728 | } | |
2729 | break; | |
b716ce68 | 2730 | case 'c': |
fac6795d DG |
2731 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
2732 | break; | |
2733 | case 'a': | |
2734 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); | |
2735 | break; | |
2736 | case 'd': | |
2737 | opt_daemon = 1; | |
2738 | break; | |
2739 | case 'g': | |
2740 | opt_tracing_group = strdup(optarg); | |
2741 | break; | |
2742 | case 'h': | |
2743 | usage(); | |
2744 | exit(EXIT_FAILURE); | |
2745 | case 'V': | |
2746 | fprintf(stdout, "%s\n", VERSION); | |
2747 | exit(EXIT_SUCCESS); | |
5b8719f5 DG |
2748 | case 'S': |
2749 | opt_sig_parent = 1; | |
2750 | break; | |
d6f42150 DG |
2751 | case 'E': |
2752 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); | |
2753 | break; | |
2754 | case 'C': | |
2755 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); | |
2756 | break; | |
75462a81 DG |
2757 | case 'q': |
2758 | opt_quiet = 1; | |
2759 | break; | |
3f9947db | 2760 | case 'v': |
53086306 DG |
2761 | /* Verbose level can increase using multiple -v */ |
2762 | opt_verbose += 1; | |
3f9947db | 2763 | break; |
31f73cc9 MD |
2764 | case 'Z': |
2765 | opt_verbose_kconsumerd += 1; | |
2766 | break; | |
fac6795d DG |
2767 | default: |
2768 | /* Unknown option or other error. | |
2769 | * Error is printed by getopt, just return */ | |
2770 | return -1; | |
2771 | } | |
2772 | } | |
2773 | ||
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | /* | |
d063d709 | 2778 | * Creates the two needed socket by the daemon. |
d6f42150 DG |
2779 | * apps_sock - The communication socket for all UST apps. |
2780 | * client_sock - The communication of the cli tool (lttng). | |
fac6795d | 2781 | */ |
cf3af59e | 2782 | static int init_daemon_socket(void) |
fac6795d DG |
2783 | { |
2784 | int ret = 0; | |
2785 | mode_t old_umask; | |
2786 | ||
2787 | old_umask = umask(0); | |
2788 | ||
2789 | /* Create client tool unix socket */ | |
d6f42150 DG |
2790 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
2791 | if (client_sock < 0) { | |
2792 | ERR("Create unix sock failed: %s", client_unix_sock_path); | |
fac6795d DG |
2793 | ret = -1; |
2794 | goto end; | |
2795 | } | |
2796 | ||
2797 | /* File permission MUST be 660 */ | |
2798 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2799 | if (ret < 0) { | |
d6f42150 | 2800 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
fac6795d DG |
2801 | perror("chmod"); |
2802 | goto end; | |
2803 | } | |
2804 | ||
2805 | /* Create the application unix socket */ | |
d6f42150 DG |
2806 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
2807 | if (apps_sock < 0) { | |
2808 | ERR("Create unix sock failed: %s", apps_unix_sock_path); | |
fac6795d DG |
2809 | ret = -1; |
2810 | goto end; | |
2811 | } | |
2812 | ||
d6f42150 | 2813 | /* File permission MUST be 666 */ |
fac6795d DG |
2814 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
2815 | if (ret < 0) { | |
d6f42150 | 2816 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
fac6795d DG |
2817 | perror("chmod"); |
2818 | goto end; | |
2819 | } | |
2820 | ||
2821 | end: | |
2822 | umask(old_umask); | |
2823 | return ret; | |
2824 | } | |
2825 | ||
2826 | /* | |
7d8234d9 MD |
2827 | * Check if the global socket is available, and if a daemon is answering |
2828 | * at the other side. If yes, error is returned. | |
fac6795d | 2829 | */ |
cf3af59e | 2830 | static int check_existing_daemon(void) |
fac6795d | 2831 | { |
7d8234d9 | 2832 | if (access(client_unix_sock_path, F_OK) < 0 && |
099e26bd | 2833 | access(apps_unix_sock_path, F_OK) < 0) { |
7d8234d9 | 2834 | return 0; |
099e26bd | 2835 | } |
7d8234d9 | 2836 | /* Is there anybody out there ? */ |
099e26bd | 2837 | if (lttng_session_daemon_alive()) { |
7d8234d9 | 2838 | return -EEXIST; |
099e26bd | 2839 | } else { |
7d8234d9 | 2840 | return 0; |
099e26bd | 2841 | } |
fac6795d DG |
2842 | } |
2843 | ||
fac6795d | 2844 | /* |
d063d709 | 2845 | * Set the tracing group gid onto the client socket. |
5e16da05 | 2846 | * |
d063d709 DG |
2847 | * Race window between mkdir and chown is OK because we are going from more |
2848 | * permissive (root.root) to les permissive (root.tracing). | |
fac6795d | 2849 | */ |
d6f42150 | 2850 | static int set_permissions(void) |
fac6795d DG |
2851 | { |
2852 | int ret; | |
996b65c8 | 2853 | gid_t gid; |
fac6795d | 2854 | |
996b65c8 MD |
2855 | gid = allowed_group(); |
2856 | if (gid < 0) { | |
a463f419 DG |
2857 | if (is_root) { |
2858 | WARN("No tracing group detected"); | |
2859 | ret = 0; | |
2860 | } else { | |
2861 | ERR("Missing tracing group. Aborting execution."); | |
2862 | ret = -1; | |
2863 | } | |
fac6795d DG |
2864 | goto end; |
2865 | } | |
2866 | ||
d6f42150 | 2867 | /* Set lttng run dir */ |
996b65c8 | 2868 | ret = chown(LTTNG_RUNDIR, 0, gid); |
d6f42150 DG |
2869 | if (ret < 0) { |
2870 | ERR("Unable to set group on " LTTNG_RUNDIR); | |
2871 | perror("chown"); | |
2872 | } | |
2873 | ||
2874 | /* lttng client socket path */ | |
996b65c8 | 2875 | ret = chown(client_unix_sock_path, 0, gid); |
fac6795d | 2876 | if (ret < 0) { |
d6f42150 DG |
2877 | ERR("Unable to set group on %s", client_unix_sock_path); |
2878 | perror("chown"); | |
2879 | } | |
2880 | ||
2881 | /* kconsumerd error socket path */ | |
996b65c8 | 2882 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
d6f42150 DG |
2883 | if (ret < 0) { |
2884 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); | |
fac6795d DG |
2885 | perror("chown"); |
2886 | } | |
2887 | ||
d6f42150 | 2888 | DBG("All permissions are set"); |
e07ae692 | 2889 | |
fac6795d DG |
2890 | end: |
2891 | return ret; | |
2892 | } | |
2893 | ||
7a485870 | 2894 | /* |
d063d709 | 2895 | * Create the pipe used to wake up the kernel thread. |
7a485870 DG |
2896 | */ |
2897 | static int create_kernel_poll_pipe(void) | |
2898 | { | |
2899 | return pipe2(kernel_poll_pipe, O_CLOEXEC); | |
2900 | } | |
2901 | ||
099e26bd DG |
2902 | /* |
2903 | * Create the application command pipe to wake thread_manage_apps. | |
2904 | */ | |
2905 | static int create_apps_cmd_pipe(void) | |
2906 | { | |
2907 | return pipe2(apps_cmd_pipe, O_CLOEXEC); | |
2908 | } | |
2909 | ||
d6f42150 | 2910 | /* |
d063d709 | 2911 | * Create the lttng run directory needed for all global sockets and pipe. |
d6f42150 DG |
2912 | */ |
2913 | static int create_lttng_rundir(void) | |
2914 | { | |
2915 | int ret; | |
2916 | ||
2917 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); | |
2918 | if (ret < 0) { | |
b1f11e69 DG |
2919 | if (errno != EEXIST) { |
2920 | ERR("Unable to create " LTTNG_RUNDIR); | |
2921 | goto error; | |
2922 | } else { | |
2923 | ret = 0; | |
2924 | } | |
d6f42150 DG |
2925 | } |
2926 | ||
2927 | error: | |
2928 | return ret; | |
2929 | } | |
2930 | ||
2931 | /* | |
d063d709 DG |
2932 | * Setup sockets and directory needed by the kconsumerd communication with the |
2933 | * session daemon. | |
d6f42150 DG |
2934 | */ |
2935 | static int set_kconsumerd_sockets(void) | |
2936 | { | |
2937 | int ret; | |
2938 | ||
2939 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { | |
2940 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); | |
2941 | } | |
2942 | ||
2943 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { | |
2944 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); | |
2945 | } | |
2946 | ||
2947 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); | |
2948 | if (ret < 0) { | |
6beb2242 DG |
2949 | if (errno != EEXIST) { |
2950 | ERR("Failed to create " KCONSUMERD_PATH); | |
2951 | goto error; | |
2952 | } | |
2953 | ret = 0; | |
d6f42150 DG |
2954 | } |
2955 | ||
2956 | /* Create the kconsumerd error unix socket */ | |
2957 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); | |
2958 | if (kconsumerd_err_sock < 0) { | |
2959 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); | |
2960 | ret = -1; | |
2961 | goto error; | |
2962 | } | |
2963 | ||
2964 | /* File permission MUST be 660 */ | |
2965 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); | |
2966 | if (ret < 0) { | |
2967 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); | |
2968 | perror("chmod"); | |
2969 | goto error; | |
2970 | } | |
2971 | ||
2972 | error: | |
2973 | return ret; | |
2974 | } | |
2975 | ||
fac6795d | 2976 | /* |
d063d709 | 2977 | * Signal handler for the daemon |
cf3af59e MD |
2978 | * |
2979 | * Simply stop all worker threads, leaving main() return gracefully | |
2980 | * after joining all threads and calling cleanup(). | |
fac6795d DG |
2981 | */ |
2982 | static void sighandler(int sig) | |
2983 | { | |
2984 | switch (sig) { | |
cf3af59e MD |
2985 | case SIGPIPE: |
2986 | DBG("SIGPIPE catched"); | |
2987 | return; | |
2988 | case SIGINT: | |
2989 | DBG("SIGINT catched"); | |
2990 | stop_threads(); | |
2991 | break; | |
2992 | case SIGTERM: | |
2993 | DBG("SIGTERM catched"); | |
2994 | stop_threads(); | |
2995 | break; | |
2996 | default: | |
2997 | break; | |
fac6795d | 2998 | } |
fac6795d DG |
2999 | } |
3000 | ||
3001 | /* | |
d063d709 | 3002 | * Setup signal handler for : |
1d4b027a | 3003 | * SIGINT, SIGTERM, SIGPIPE |
fac6795d | 3004 | */ |
1d4b027a | 3005 | static int set_signal_handler(void) |
fac6795d | 3006 | { |
1d4b027a DG |
3007 | int ret = 0; |
3008 | struct sigaction sa; | |
3009 | sigset_t sigset; | |
fac6795d | 3010 | |
1d4b027a DG |
3011 | if ((ret = sigemptyset(&sigset)) < 0) { |
3012 | perror("sigemptyset"); | |
3013 | return ret; | |
3014 | } | |
d6f42150 | 3015 | |
1d4b027a DG |
3016 | sa.sa_handler = sighandler; |
3017 | sa.sa_mask = sigset; | |
3018 | sa.sa_flags = 0; | |
3019 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { | |
3020 | perror("sigaction"); | |
3021 | return ret; | |
d6f42150 DG |
3022 | } |
3023 | ||
1d4b027a DG |
3024 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
3025 | perror("sigaction"); | |
3026 | return ret; | |
d6f42150 | 3027 | } |
aaf26714 | 3028 | |
1d4b027a DG |
3029 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
3030 | perror("sigaction"); | |
3031 | return ret; | |
8c0faa1d DG |
3032 | } |
3033 | ||
1d4b027a DG |
3034 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
3035 | ||
3036 | return ret; | |
fac6795d DG |
3037 | } |
3038 | ||
f3ed775e | 3039 | /* |
d063d709 DG |
3040 | * Set open files limit to unlimited. This daemon can open a large number of |
3041 | * file descriptors in order to consumer multiple kernel traces. | |
f3ed775e DG |
3042 | */ |
3043 | static void set_ulimit(void) | |
3044 | { | |
3045 | int ret; | |
3046 | struct rlimit lim; | |
3047 | ||
a88df331 | 3048 | /* The kernel does not allowed an infinite limit for open files */ |
f3ed775e DG |
3049 | lim.rlim_cur = 65535; |
3050 | lim.rlim_max = 65535; | |
3051 | ||
3052 | ret = setrlimit(RLIMIT_NOFILE, &lim); | |
3053 | if (ret < 0) { | |
3054 | perror("failed to set open files limit"); | |
3055 | } | |
3056 | } | |
3057 | ||
fac6795d DG |
3058 | /* |
3059 | * main | |
3060 | */ | |
3061 | int main(int argc, char **argv) | |
3062 | { | |
fac6795d DG |
3063 | int ret = 0; |
3064 | void *status; | |
b082db07 | 3065 | const char *home_path; |
fac6795d | 3066 | |
273ea72c | 3067 | /* Create thread quit pipe */ |
cf3af59e MD |
3068 | if ((ret = init_thread_quit_pipe()) < 0) { |
3069 | goto error; | |
273ea72c DG |
3070 | } |
3071 | ||
fac6795d DG |
3072 | /* Parse arguments */ |
3073 | progname = argv[0]; | |
3074 | if ((ret = parse_args(argc, argv) < 0)) { | |
cf3af59e | 3075 | goto error; |
fac6795d DG |
3076 | } |
3077 | ||
3078 | /* Daemonize */ | |
3079 | if (opt_daemon) { | |
53094c05 DG |
3080 | ret = daemon(0, 0); |
3081 | if (ret < 0) { | |
3082 | perror("daemon"); | |
cf3af59e | 3083 | goto error; |
53094c05 | 3084 | } |
fac6795d DG |
3085 | } |
3086 | ||
3087 | /* Check if daemon is UID = 0 */ | |
3088 | is_root = !getuid(); | |
3089 | ||
fac6795d | 3090 | if (is_root) { |
d6f42150 DG |
3091 | ret = create_lttng_rundir(); |
3092 | if (ret < 0) { | |
cf3af59e | 3093 | goto error; |
d6f42150 DG |
3094 | } |
3095 | ||
fac6795d | 3096 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 DG |
3097 | snprintf(apps_unix_sock_path, PATH_MAX, |
3098 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); | |
fac6795d DG |
3099 | } |
3100 | ||
3101 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 DG |
3102 | snprintf(client_unix_sock_path, PATH_MAX, |
3103 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); | |
3104 | } | |
fac6795d | 3105 | } else { |
b082db07 DG |
3106 | home_path = get_home_dir(); |
3107 | if (home_path == NULL) { | |
273ea72c DG |
3108 | /* TODO: Add --socket PATH option */ |
3109 | ERR("Can't get HOME directory for sockets creation."); | |
cf3af59e MD |
3110 | ret = -EPERM; |
3111 | goto error; | |
b082db07 DG |
3112 | } |
3113 | ||
fac6795d | 3114 | if (strlen(apps_unix_sock_path) == 0) { |
d6f42150 | 3115 | snprintf(apps_unix_sock_path, PATH_MAX, |
b082db07 | 3116 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
fac6795d DG |
3117 | } |
3118 | ||
3119 | /* Set the cli tool unix socket path */ | |
3120 | if (strlen(client_unix_sock_path) == 0) { | |
d6f42150 | 3121 | snprintf(client_unix_sock_path, PATH_MAX, |
b082db07 | 3122 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
fac6795d DG |
3123 | } |
3124 | } | |
3125 | ||
847177cd DG |
3126 | DBG("Client socket path %s", client_unix_sock_path); |
3127 | DBG("Application socket path %s", apps_unix_sock_path); | |
3128 | ||
273ea72c | 3129 | /* |
7d8234d9 | 3130 | * See if daemon already exist. |
fac6795d | 3131 | */ |
7d8234d9 | 3132 | if ((ret = check_existing_daemon()) < 0) { |
75462a81 | 3133 | ERR("Already running daemon.\n"); |
273ea72c | 3134 | /* |
cf3af59e MD |
3135 | * We do not goto exit because we must not cleanup() |
3136 | * because a daemon is already running. | |
ab118b20 | 3137 | */ |
cf3af59e | 3138 | goto error; |
a88df331 DG |
3139 | } |
3140 | ||
3141 | /* After this point, we can safely call cleanup() so goto error is used */ | |
3142 | ||
3143 | /* | |
3144 | * These actions must be executed as root. We do that *after* setting up | |
3145 | * the sockets path because we MUST make the check for another daemon using | |
3146 | * those paths *before* trying to set the kernel consumer sockets and init | |
3147 | * kernel tracer. | |
3148 | */ | |
3149 | if (is_root) { | |
3150 | ret = set_kconsumerd_sockets(); | |
3151 | if (ret < 0) { | |
cf3af59e | 3152 | goto exit; |
a88df331 DG |
3153 | } |
3154 | ||
3155 | /* Setup kernel tracer */ | |
3156 | init_kernel_tracer(); | |
3157 | ||
3158 | /* Set ulimit for open files */ | |
3159 | set_ulimit(); | |
fac6795d DG |
3160 | } |
3161 | ||
cf3af59e MD |
3162 | if ((ret = set_signal_handler()) < 0) { |
3163 | goto exit; | |
fac6795d DG |
3164 | } |
3165 | ||
d6f42150 | 3166 | /* Setup the needed unix socket */ |
cf3af59e MD |
3167 | if ((ret = init_daemon_socket()) < 0) { |
3168 | goto exit; | |
fac6795d DG |
3169 | } |
3170 | ||
3171 | /* Set credentials to socket */ | |
cf3af59e MD |
3172 | if (is_root && ((ret = set_permissions()) < 0)) { |
3173 | goto exit; | |
fac6795d DG |
3174 | } |
3175 | ||
5b8719f5 DG |
3176 | /* Get parent pid if -S, --sig-parent is specified. */ |
3177 | if (opt_sig_parent) { | |
3178 | ppid = getppid(); | |
3179 | } | |
3180 | ||
7a485870 | 3181 | /* Setup the kernel pipe for waking up the kernel thread */ |
cf3af59e MD |
3182 | if ((ret = create_kernel_poll_pipe()) < 0) { |
3183 | goto exit; | |
7a485870 DG |
3184 | } |
3185 | ||
099e26bd DG |
3186 | /* Setup the thread apps communication pipe. */ |
3187 | if ((ret = create_apps_cmd_pipe()) < 0) { | |
3188 | goto exit; | |
3189 | } | |
3190 | ||
3191 | /* Init UST command queue. */ | |
3192 | cds_wfq_init(&ust_cmd_queue.queue); | |
3193 | ||
273ea72c DG |
3194 | /* |
3195 | * Get session list pointer. This pointer MUST NOT be free(). | |
3196 | * This list is statically declared in session.c | |
3197 | */ | |
b5541356 DG |
3198 | session_list_ptr = get_session_list(); |
3199 | ||
cf3af59e | 3200 | /* Create thread to manage the client socket */ |
099e26bd DG |
3201 | ret = pthread_create(&client_thread, NULL, |
3202 | thread_manage_clients, (void *) NULL); | |
cf3af59e | 3203 | if (ret != 0) { |
099e26bd | 3204 | perror("pthread_create clients"); |
cf3af59e MD |
3205 | goto exit_client; |
3206 | } | |
fac6795d | 3207 | |
099e26bd DG |
3208 | /* Create thread to dispatch registration */ |
3209 | ret = pthread_create(&dispatch_thread, NULL, | |
3210 | thread_dispatch_ust_registration, (void *) NULL); | |
3211 | if (ret != 0) { | |
3212 | perror("pthread_create dispatch"); | |
3213 | goto exit_dispatch; | |
3214 | } | |
3215 | ||
3216 | /* Create thread to manage application registration. */ | |
3217 | ret = pthread_create(®_apps_thread, NULL, | |
3218 | thread_registration_apps, (void *) NULL); | |
3219 | if (ret != 0) { | |
3220 | perror("pthread_create registration"); | |
3221 | goto exit_reg_apps; | |
3222 | } | |
3223 | ||
cf3af59e MD |
3224 | /* Create thread to manage application socket */ |
3225 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); | |
3226 | if (ret != 0) { | |
099e26bd | 3227 | perror("pthread_create apps"); |
cf3af59e MD |
3228 | goto exit_apps; |
3229 | } | |
fac6795d | 3230 | |
cf3af59e MD |
3231 | /* Create kernel thread to manage kernel event */ |
3232 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); | |
3233 | if (ret != 0) { | |
099e26bd | 3234 | perror("pthread_create kernel"); |
cf3af59e MD |
3235 | goto exit_kernel; |
3236 | } | |
7a485870 | 3237 | |
cf3af59e MD |
3238 | ret = pthread_join(kernel_thread, &status); |
3239 | if (ret != 0) { | |
3240 | perror("pthread_join"); | |
3241 | goto error; /* join error, exit without cleanup */ | |
fac6795d DG |
3242 | } |
3243 | ||
cf3af59e MD |
3244 | exit_kernel: |
3245 | ret = pthread_join(apps_thread, &status); | |
3246 | if (ret != 0) { | |
3247 | perror("pthread_join"); | |
3248 | goto error; /* join error, exit without cleanup */ | |
3249 | } | |
fac6795d | 3250 | |
cf3af59e | 3251 | exit_apps: |
099e26bd DG |
3252 | ret = pthread_join(reg_apps_thread, &status); |
3253 | if (ret != 0) { | |
3254 | perror("pthread_join"); | |
3255 | goto error; /* join error, exit without cleanup */ | |
3256 | } | |
3257 | ||
3258 | exit_reg_apps: | |
3259 | ret = pthread_join(dispatch_thread, &status); | |
3260 | if (ret != 0) { | |
3261 | perror("pthread_join"); | |
3262 | goto error; /* join error, exit without cleanup */ | |
3263 | } | |
3264 | ||
3265 | exit_dispatch: | |
cf3af59e MD |
3266 | ret = pthread_join(client_thread, &status); |
3267 | if (ret != 0) { | |
3268 | perror("pthread_join"); | |
3269 | goto error; /* join error, exit without cleanup */ | |
3270 | } | |
3271 | ||
3272 | ret = join_kconsumerd_thread(); | |
3273 | if (ret != 0) { | |
3274 | perror("join_kconsumerd"); | |
3275 | goto error; /* join error, exit without cleanup */ | |
3276 | } | |
a88df331 | 3277 | |
cf3af59e | 3278 | exit_client: |
a88df331 | 3279 | exit: |
cf3af59e MD |
3280 | /* |
3281 | * cleanup() is called when no other thread is running. | |
3282 | */ | |
3283 | cleanup(); | |
3284 | if (!ret) | |
3285 | exit(EXIT_SUCCESS); | |
3286 | error: | |
5e16da05 | 3287 | exit(EXIT_FAILURE); |
fac6795d | 3288 | } |